to_o october_n when_o mr._n burrowes_n do_v observe_v be_v four_o month_n which_o take_v away_o the_o twelve_o minute_n mr._n john_n kepler_n that_o be_v mathematician_n to_o the_o emperor_n of_o germany_n by_o his_o chronology_n of_o time_n account_v it_o from_o the_o creation_n of_o the_o world_n to_o the_o year_n of_o our_o lord_n 1657_o to_o be_v 5650_o year_n and_o this_o motion_n of_o the_o magnetic_a pole_n notwithstanding_o it_o be_v many_o time_n swift_a than_o that_o motion_n he_o account_v upon_o yet_o give_v the_o same_o time_n with_o he_o which_o make_v i_o much_o to_o admire_v it_o i_o doubt_v not_o but_o the_o learned_a in_o astronomy_n will_v in_o time_n collect_v something_o more_o from_o it_o than_o i_o have_v do_v or_o than_o have_v be_v former_o know_v their_o motion_n be_v by_o six_o six_o ten_o of_o a_o degree_n in_o one_o year_n six_o degree_n in_o ten_o year_n sixty_o degree_n in_o a_o hundred_o year_n and_o six_o time_n sixty_o degree_n in_o six_o hundred_o 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first_o that_o ever_o we_o read_v or_o hear_v of_o that_o find_v out_o the_o inclinatory_a motion_n of_o the_o magnetic_a needle_n who_o name_n ought_v to_o be_v remember_v for_o this_o thing_n and_o mr._n william_n burrowes_n for_o the_o variation_n of_o the_o compass_n almighty_a god_n be_v please_v by_o these_o two_o man_n so_o to_o honour_v our_o nation_n that_o the_o variation_n and_o the_o inclination_n of_o the_o magnetic_a needle_n shall_v be_v first_o find_v in_o this_o nation_n above_o all_o the_o christian_a nation_n in_o the_o world_n and_o now_o almighty_a god_n be_v please_v above_o ninety_o year_n after_o they_o to_o make_v i_o a_o instrument_n in_o his_o hand_n to_o put_v it_o to_o a_o use_v not_o former_o think_v of_o that_o be_v to_o find_v the_o longitude_n that_o as_o the_o begin_n of_o it_o be_v in_o this_o kingdom_n so_o the_o conclusion_n of_o it_o shall_v be_v here_o for_o the_o honour_n of_o our_o gracious_a king_n majesty_n and_o his_o kingdom_n unto_o who_o i_o humble_o beseech_v almighty_a god_n to_o grant_v a_o long_a a_o prosperous_a a_o happy_a reign_n and_o victory_n over_o all_o his_o enemy_n amen_n robert_n norman_n in_o his_o new_a attractiveâ—_n mention_n one_o petro_n de_fw-fr medina_n that_o in_o a_o book_n of_o his_o concern_v navigation_n do_v hold_v it_o for_o a_o absurdity_n for_o man_n to_o say_v that_o the_o magnetic_a needle_n have_v any_o variation_n at_o all_o he_o say_v it_o be_v a_o error_n in_o the_o misplace_n of_o the_o wire_n but_o leave_v he_o and_o his_o error_n i_o shall_v show_v how_o mr._n norman_n come_v to_o find_v the_o inclination_n of_o the_o inclinatory_a needle_n as_o he_o himself_o write_v and_o how_o he_o come_v to_o think_v of_o such_o a_o needle_n he_o have_v make_v a_o large_a horizontal_a needle_n and_o bestow_v much_o time_n and_o pain_n in_o fit_v and_o polish_n of_o it_o and_o have_v equal_o poize_v it_o on_o its_o pin_n and_o when_o he_o have_v touch_v it_o with_o the_o loadstone_n and_o put_v it_o on_o its_o pin_n again_o the_o north_n end_n of_o it_o incline_v so_o low_a that_o it_o be_v not_o fit_a for_o use_v he_o think_v to_o mend_v it_o by_o cut_v off_o some_o of_o the_o end_n of_o it_o and_o cut_v off_o so_o much_o that_o he_o spoil_v the_o needle_n which_o bring_v he_o into_o a_o passion_n with_o himself_o after_o his_o passion_n be_v over_o he_o consider_v with_o himself_o whether_o there_o may_v not_o be_v such_o a_o motion_n of_o the_o needle_n and_o then_o make_v one_o and_o find_v it_o so_o from_o whence_o it_o appear_v plain_o that_o the_o inclinatory_a motion_n of_o the_o needle_n be_v the_o natural_a motion_n and_o that_o the_o horizontal_a motion_n although_o it_o be_v of_o admirable_a use_n in_o the_o world_n yet_o it_o be_v a_o force_a motion_n some_o year_n since_o i_o see_v a_o inclinatory_a needle_n of_o one_o doctor_n meret_n of_o the_o physician_n college_n in_o london_n which_o be_v make_v by_o robert_n norman_n in_o 1578_o it_o be_v out_o of_o order_n i_o fit_v it_o for_o he_o the_o use_n of_o the_o inclinatory_a needle_n i_o shall_v hereafter_o show_v to_o find_v the_o longitude_n which_o be_v a_o use_n that_o our_o former_a learned_a magnetic_a philosopher_n do_v not_o think_v of_o in_o their_o time_n because_o they_o know_v not_o the_o variate_a of_o the_o variation_n we_o be_v to_o take_v notice_n that_o as_o there_o be_v a_o magnetic_a sphere_n that_o have_v two_o pole_n so_o there_o be_v other_o circle_n belong_v to_o it_o as_o to_o the_o other_o sphere_n a_o aequator_fw-la two_o colour_n and_o parallel_v circle_n to_o the_o aequator_fw-la the_o aequator_fw-la for_o distinction_n sake_n i_o call_v the_o magnequator_fw-la the_o colour_n wherein_o the_o pole_n be_v the_o magnestical_a colour_n the_o other_o the_o magnoctial_a colour_n the_o magnequator_fw-la do_v in_o a_o manner_n represent_v the_o moon_n difference_n because_o the_o magnoctial_a intersection_n with_o the_o aequator_fw-la of_o the_o earth_n have_v a_o retrograde_a motion_n as_o the_o head_n and_o tail_n of_o the_o dragon_n have_v also_o the_o magnequator_fw-la do_v in_o a_o manner_n represent_v the_o ecliptic_a have_v a_o form_n of_o situation_n to_o the_o aequator_fw-la of_o the_o earth_n that_o the_o ecliptic_a have_v to_o the_o aequator_fw-la of_o the_o heaven_n the_o great_a obliquity_n be_v but_o 8_o d._n 30._o m._n as_o appear_v in_o the_o first_o scheme_n as_o by_o the_o latitude_n and_o declination_n of_o a_o star_n in_o the_o heaven_n and_o know_v on_o which_o side_n of_o the_o solstitial_a colour_n it_o be_v the_o right_a ascension_n may_v be_v exact_o calculate_v so_o in_o this_o if_o the_o latitude_n of_o any_o place_n be_v give_v with_o the_o inclination_n of_o the_o needle_n and_o on_o which_o side_n of_o the_o magnetical_a solstitial_a colour_n it_o be_v the_o longitude_n of_o the_o place_n may_v be_v find_v from_o the_o magnetical_a colour_n and_o from_o that_o the_o longitude_n from_o any_o place_n in_o the_o world_n as_o i_o shall_v make_v it_o appear_v by_o example_n follow_v but_o before_o i_o go_v further_o i_o shall_v say_v something_o of_o the_o decrease_v of_o our_o variation_n here_o at_o london_n since_o the_o time_n of_o mr._n william_n burrowes_n observation_n in_o october_n 1580_o and_o shall_v set_v down_o what_o the_o variation_n have_v be_v find_v then_o and_o since_o by_o observation_n and_o by_o my_o calculation_n according_a to_o the_o motion_n of_o the_o magnetical_a pole_n  _fw-fr d._n ′_o ″_o  _fw-fr d._n ′_o ″_o  _fw-fr in_o 1580_o m._n w._n burrowes_n 11-15-00_a bond_n 11-15-00_a east_n in_o 1622_o m._n edm._n gunter_n 05-55-37_a bond_n 05-57-00_a in_o 1634_o m._n h._n gellibrand_n 4-03-00_a bond_n 4-01-00_a in_o 1640_o bond_n &_o other_o 3-06-40_a bond._n 2-59-00_a in_o 1665_o mr._n robert_n hooke_n the_o professor_n of_o geometry_n in_o gresham_n college_n in_o london_n with_o mr._n william_n mar_n mr._n richard_n shortgrave_n and_o a_o gentleman_n since_o decease_a and_o henry_n bond_n sen._n on_o the_o 8_o of_o june_n in_o the_o king_n majesty_n private_a garden_n at_o white-hall_n observe_v the_o variation_n and_o find_v it_o to_o be_v 1_o d._n 22_o m._n 30_o sec_fw-la west_n by_o bond_n be_v calculation_n it_o be_v then_o 1_o d._n 25_o m._n 00_o sec_fw-la i_o have_v set_v down_o these_o both_o by_o observation_n and_o also_o by_o my_o calculation_n to_o give_v the_o world_n satisfaction_n that_o i_o do_v not_o delude_v they_o to_o make_v they_o think_v that_o i_o know_v such_o thing_n and_o can_v prove_v they_o when_o any_o that_o understand_v themselves_o have_v make_v trial_n by_o exact_a observation_n and_o my_o calculation_n they_o will_v acknowledge_v i_o to_o be_v honest_a in_o that_o which_o i_o have_v write_v there_o be_v one_o that_o put_v it_o out_o
between_o the_o earths-zenith_n of_o london_n and_o the_o magnepole_n to_o be_v 33_o d._n 19_o m._n to_o which_o the_o inclination_n against_o it_o in_o the_o caroline_n table_n be_v 71_o d._n 48_o m._n which_o differ_v but_o two_o minute_n from_o tnat_fw-la which_o robert_z norman_n say_v it_o be_v about_o viz._n 71_o d._n 50_o m._n if_o robert_n norman_n have_v set_v down_o the_o year_n and_o the_o time_n of_o the_o year_n when_o his_o observation_n of_o the_o inclination_n be_v make_v as_o mr._n burrowes_n do_v of_o the_o variation_n we_o shall_v not_o have_v differ_v any_o thing_n at_o all_o from_o he_o the_o inclination_n be_v then_o increase_a but_o now_o it_o be_v decrease_v aind_a will_v be_v until_o the_o year_n 1957_o and_o then_o the_o variation_n will_v be_v nothing_o at_o london_n as_o it_o be_v nothing_o in_o 1657_o be_v 300_o year_n distant_a if_o we_o divide_v the_o year_n into_o thirty_o six_o part_n we_o shall_v find_v in_o what_o time_n the_o procession_n of_o the_o magnesticial_a colour_n go_v forward_o one_o minute_n or_o one_o mile_n of_o the_o equator_fw-la of_o the_o earth_n which_o time_n will_v be_v ten_o day_n three_o hour_n and_o thirty_o minute_n which_o be_v multiply_v by_o 36_o tne_n product_n will_v be_v 365_o day_n and_o 6_o hour_n have_v go_v thus_o far_o to_o find_v in_o what_o time_n the_o magnesticial_a colour_n go_v forward_o one_o mile_n of_o the_o aequator_fw-la of_o the_o earth_n if_o we_o examine_v how_o much_o it_o go_v forward_o in_o 24_o hour_n it_o will_v be_v 591.37_o foot_n and_o in_o one_o hour_n 24.64_o foot_n here_o we_o account_v one_o mile_n according_a to_o mr._n richard_n norwood_n experiment_n set_v down_o in_o his_o sea-man_n practice_n which_o be_v 6000_o english_a foot_n to_o one_o mile_n or_o minute_n of_o the_o aequator_fw-la or_o meridian_n according_a to_o the_o french_a 26.39_o in_o one_o hour_n and_o in_o one_o minute_n 5.278_o inch_n the_o last_o thing_n shall_v be_v to_o find_v the_o least_o and_o the_o great_a inclination_n of_o the_o inclinatory_a needle_n in_o any_o latitude_n subtract_v 8_o d._n 30_o m._n from_o the_o compliment_n of_o the_o latitude_n and_o look_v the_o remainder_n in_o the_o table_n and_o right_a against_o it_o be_v the_o great_a inclination_n in_o that_o latitude_n and_o add_v 8_o d._n 30_o m._n to_o the_o compliment_n of_o the_o latitude_n and_o look_v the_o sum_n in_o the_o table_n and_o right_a against_o it_o be_v the_o least_o inclination_n example_n 1._o here_o at_o london_n the_o compliment_n of_o the_o latitude_n 38_o d._n 28_o m._n and_o 8_o d._n 30_o m._n add_v together_o the_o sum_n be_v 46_o d._n 58._o m._n against_o which_o there_o be_v in_o the_o table_n 61_o d._n 50_o m._n the_o least_o inclination_n and_o subtract_v 8_o d._n 30_o m._n from_o 38_o d._n 28_o m._n and_o the_o remainder_n be_v 29_o d._n 58_o m._n against_o which_o in_o the_o table_n be_v 73_o d._n 55_o m._n the_o great_a inclination_n here_o at_o london_n which_o be_v in_o the_o year_n 1657._o if_o the_o compliment_n of_o the_o latitude_n and_o 8_o d._n 30_o m._n add_v together_o exceed_v 90_o d._n 00_o m._n subtract_v it_o out_o of_o 180_o d._n 00_o m._n and_o look_v the_o remainder_n in_o the_o table_n then_o if_o the_o latitude_n give_v be_v north_n the_o least_o inclination_n be_v of_o the_o south_n end_n of_o the_o needle_n but_o if_o the_o latitude_n give_v be_v south_n the_o least_o inclination_n be_v of_o the_o north_n end_n of_o the_o needle_n example_n ii_o in_o north_n latitude_n 7_o d._n 00_o m._n the_o compliment_n 83_o d._n 00_o m._n unto_o which_o 8_o d._n 30_o m._n add_v make_v 91_o d._n 30_o m._n the_o remainder_n to_o 180_o d._n 00_o m._n be_v 88_o d._n 30_o m._n against_o which_o in_o the_o table_n be_v 3_o d._n 00_o m._n the_o least_o inclination_n of_o the_o south_n end_n of_o the_o needle_n the_o great_a inclination_n will_v be_v of_o the_o north_n end_n then_o subtract_v 8_o d._n 30_o m._n from_o 83_o d._n 00_o m._n the_o compliment_n of_o the_o latitude_n the_o remainder_n be_v 74_o d._n 30_o m._n against_o which_o in_o the_o table_n be_v 29_o d._n 00_o m._n for_o the_o great_a inclination_n of_o the_o north_n end_n of_o the_o needle_n in_o that_o latitude_n here_o be_v the_o conclusion_n of_o thirty_o eight_o year_n magnetic_a study_n and_o observation_n i_o know_v when_o this_o mystery_n come_v to_o be_v public_o and_o foreign_o know_v it_o will_v be_v the_o admiration_n of_o all_o the_o christian_a nation_n in_o the_o world_n what_o then_o shall_v any_o man_n have_v high_a thought_n of_o himself_o for_o it_o god_n forbid_v far_o be_v it_o from_o he_o let_v he_o look_v upon_o himself_o as_o a_o instrument_n in_o the_o hand_n of_o almighty_n god_n to_o declare_v that_o which_o he_o have_v conceal_v until_o his_o own_o time_n come_v that_o he_o be_v please_v to_o make_v it_o know_v for_o his_o own_o glory_n and_o the_o benefit_n of_o man_n in_o the_o world_n therefore_o unto_o almighty_a god_n be_v all_o the_o praise_n and_o glory_n of_o this_o and_o all_o the_o rest_n of_o his_o wonderful_a work_n here_o follow_v the_o caroline_n table_n of_o the_o compliment_n of_o the_o magnilatitude_n to_o every_o five_o minute_n of_o inclination_n of_o the_o inclinatory_a needle_n from_o the_o magnequator_fw-la unto_o 84_o d._n 01_o m._n of_o magnilatitude_n and_o 87_o d._n 00_o m._n of_o inclination_n d._n m._n d._n m._n 0_o 05_o 89_o 58_o 0_o 10_o 89_o 55_o 0_o 15_o 89_o 53_o 0_o 20_o 89_o 50_o 0_o 25_o 89_o 48_o 0_o 30_o 89_o 45_o 0_o 35_o 89_o 43_o 0_o 40_o 89_o 40_o 0_o 45_o 89_o 38_o 0_o 50_o 89_o 35_o 0_o 55_o 89_o 33_o 1_o 00_o 89_o 30_o 1_o 05_o 89_o 28_o 1_o 10_o 89_o 25_o 1_o 15_o 89_o 23_o 1_o 20_o 89_o 20_o 1_o 25_o 89_o 18_o 1_o 30_o 89_o 15_o 1_o 35_o 89_o 13_o 1_o 40_o 89_o 10_o 1_o 45_o 89_o 08_o 1_o 50_o 89_o 05_o 1_o 55_o 89_o 03_o 2_o 00_o 89_o 00_o 2_o 05_o 88_o 58_o 2_o 10_o 88_o 55_o 2_o 15_o 88_o 53_o 2_o 20_o 88_o 50_o 2_o 25_o 88_o 48_o 2_o 30_o 88_o 45_o 2_o 35_o 88_o 43_o 2_o 40_o 88_o 40_o 2_o 45_o 88_o 38_o 2_o 50_o 88_o 35_o 2_o 55_o 88_o 32_o 3_o 00_o 88_o 30_o 3_o 05_o 88_o 28_o 3_o 10_o 88_o 25_o 3_o 15_o 88_o 22_o 3_o 20_o 88_o 20_o 3_o 25_o 88_o 18_o 3_o 30_o 88_o 15_o 3_o 35_o 88_o 13_o 3_o 40_o 88_o 10_o 3_o 45_o 88_o 08_o 3_o 50_o 88_o 05_o 3_o 55_o 88_o 03_o 4_o 00_o 88_o 00_o 4_o 05_o 87_o 57_o 4_o 10_o 87_o 55_o 4_o 15_o 87_o 53_o 4_o 20_o 87_o 50_o 4_o 25_o 87_o 48_o 4_o 30_o 87_o 45_o 4_o 35_o 87_o 42_o 4_o 40_o 87_o 40_o 4_o 45_o 87_o 37_o 4_o 50_o 87_o 35_o 4_o 55_o 87_o 32_o 5_o 00_o 87_o 30_o 5_o 05_o 87_o 27_o 5_o 10_o 87_o 25_o 5_o 15_o 87_o 22_o 5_o 20_o 87_o 20_o 5_o 25_o 87_o 17_o 5_o 30_o 87_o 15_o 5_o 35_o 87_o 12_o 5_o 40_o 87_o 10_o 5_o 45_o 87_o 07_o 5_o 50_o 87_o 05_o 5_o 55_o 87_o 02_o 6_o 00_o 87_o 00_o 6_o 05_o 86_o 57_o 6_o 10_o 86_o 55_o 6_o 15_o 86_o 52_o 6_o 20_o 86_o 50_o 6_o 25_o 86_o 47_o 6_o 30_o 86_o 45_o 6_o 35_o 86_o 42_o 6_o 40_o 86_o 40_o 6_o 45_o 86_o 37_o 6_o 50_o 86_o 35_o 6_o 55_o 86_o 32_o 7_o 00_o 86_o 29_o 7_o 05_o 86_o 27_o 7_o 10_o 86_o 24_o 7_o 15_o 86_o 21_o 7_o 20_o 86_o 19_o 7_o 25_o 86_o 16_o 7_o 30_o 86_o 14_o 7_o 35_o 86_o 11_o 7_o 40_o 86_o 09_o 7_o 45_o 86_o 06_o 7_o 50_o 86_o 04_o 7_o 55_o 86_o 01_o 8_o 00_o 85_o 59_o 8_o 05_o 85_o 56_o 8_o 10_o 85_o 54_o 8_o 15_o 85_o 51_o 8_o 20_o 85_o 49_o 8_o 25_o 85_o 46_o 8_o 30_o 85_o 44_o 8_o 35_o 85_o 41_o 8_o 40_o 85_o 39_o 8_o 45_o 85_o 36_o 8_o 50_o 85_o 34_o 8_o 55_o 85_o 31_o 9_o 00_o 85_o 29_o 9_o 05_o 85_o 26_o 9_o 10_o 85_o 23_o 9_o 15_o 85_o 20_o 9_o 20_o 85_o 18_o 9_o 25_o 85_o 16_o 9_o 30_o 85_o 13_o 9_o 35_o 85_o 10_o 9_o 40_o 85_o 08_o 9_o 45_o 85_o 05_o 9_o 50_o 85_o 03_o 9_o 55_o 85_o 01_o 10_o 00_o 84_o 58_o 10_o 05_o 84_o 55_o 10_o 10_o 84_o 53_o 10_o 15_o 84_o 50_o 10_o 20_o 84_o 47_o 10_o 25_o 84_o 45_o 10_o 30_o 84_o 42_o 10_o 35_o 84_o 40_o 10_o 40_o 84_o 37_o 10_o 45_o 84_o 35_o 10_o 50_o 84_o 32_o 10_o 55_o 84_o 29_o 11_o 00_o 84_o 27_o 11_o 05_o 84_o 24_o 11_o 10_o 84_o 22_o 11_o 15_o 84_o 19_o 11_o 20_o 84_o 17_o 11_o 25_o 84_o 14_o 11_o 30_o 84_o 12_o 11_o 35_o 84_o 09_o 11_o 40_o 84_o 06_o 11_o 45_o 84_o 04_o 11_o
any_o other_o place_n within_o our_o dominion_n and_o all_o other_o our_o officer_n and_o minister_n who_o it_o may_v concern_v be_v to_o take_v particular_a notice_n that_o due_a obedience_n be_v give_v to_o this_o our_o royal_a command_n give_v under_o our_o signet_n and_o sign_n manual_n at_o our_o court_n at_o whitehall_n the_o twenty_o eight_o day_n of_o june_n in_o the_o eight_o and_o twenty_o year_n of_o our_o reign_n 1676._o by_o his_o majesty_n command_n vera_fw-la copia_fw-la joseph_n williamson_n the_o longitude_v find_v whereas_o of_o late_a day_n there_o have_v be_v pretend_v for_o longitude_n i_o shall_v not_o trouble_v myself_o with_o contradict_v any_o of_o their_o way_n but_o show_v a_o way_n which_o almighty_a god_n have_v make_v know_v to_o i_o and_o have_v be_v prove_v by_o observation_n in_o remote_a part_n of_o the_o world_n there_o have_v be_v some_o in_o former_a day_n that_o have_v think_v they_o can_v find_v the_o latitude_n of_o any_o place_n by_o the_o inclination_n of_o the_o inclinatory_n magnetical_a needle_n under_o the_o horizon_n wherein_o they_o be_v much_o deceive_v because_o the_o magnetical_a needle_n respect_v its_o own_o pole_n i_o mean_v the_o inclinatory_a needle_n and_o not_o the_o pole_n of_o the_o world_n except_o it_o be_v in_o one_o meridian_n in_o two_o opposite_a point_n yet_o i_o honour_v their_o name_n and_o memory_n viz._n dr._n gilbert_n physician_n in_o ordinary_a to_o queen_n elizabeth_n and_o mr._n barlow_n of_o winchester_n because_o they_o make_v know_v to_o the_o world_n their_o opinion_n of_o that_o which_o they_o know_v in_o their_o time_n and_o although_o the_o inclinatory_a needle_n can_v show_v the_o latitude_n because_o there_o be_v one_o and_o the_o same_o inclination_n in_o a_o hundred_o several_a latitude_n yet_o it_o show_v something_o else_o which_o be_v a_o mean_n to_o find_v the_o longitude_n which_o i_o shall_v show_v and_o prove_v in_o my_o further_a discourse_n in_o the_o mean_a time_n i_o be_o sorry_a that_o any_o one_o shall_v be_v so_o impudent_a in_o our_o day_n to_o put_v it_o out_o in_o print_n the_o latitude_n may_v be_v find_v by_o the_o inclination_n of_o the_o inclinatory_a needle_n and_o mr._n edward_n wright_n table_n of_o inclination_n in_o his_o book_n of_o the_o correction_n of_o error_n in_o navigation_n if_o that_o have_v be_v for_o that_o use_n it_o have_v be_v make_v use_n of_o many_o year_n before_o he_o be_v bear_v that_o have_v put_v it_o out_o in_o print_n mr._n edward_n wright_n in_o the_o latter_a end_n of_o his_o book_n of_o the_o correction_n of_o error_n in_o navigation_n set_v down_o several_a reason_n as_o he_o think_v against_o magnetical_a pole_n but_o i_o shall_v make_v it_o manifest_a from_o eighty_o five_o year_n observation_n that_o there_o be_v two_o magnetical_a pole_n the_o one_o north_n and_o the_o other_o south_n i_o write_v in_o the_o seaman_n calendar_n above_o thirty_o year_n since_o that_o there_o be_v and_o that_o i_o know_v their_o latitude_n their_o longitude_n and_o their_o annual_a motion_n which_o motion_n of_o they_o be_v the_o cause_n of_o the_o variate_a of_o the_o variation_n of_o the_o magnetical_a needle_n or_o compass_n and_o the_o cause_n of_o the_o alteration_n of_o the_o inclinatory_a needle_n i_o do_v in_o that_o calendar_n foretell_v twenty_o year_n before_o it_o come_v to_o pass_v that_o in_o the_o year_n 1657_o there_o will_v be_v no_o variation_n at_o all_o at_o london_n which_o be_v find_v to_o be_v so_o and_o since_o it_o have_v be_v westerly_a and_o will_v be_v three_o hundred_o year_n after_o 1657._o mr._n william_n burrowes_n in_o his_o tract_n of_o the_o variation_n of_o the_o compass_n have_v some_o thought_n of_o magnetical_a pole_n and_o have_v some_o calculation_n to_o find_v their_o distance_n from_o the_o pole_n of_o the_o world_n but_o his_o mind_n be_v that_o they_o be_v or_o rather_o the_o north_n magnetic_a pole_n be_v far_o from_o the_o zenith_n of_o london_n than_o the_o pole_n of_o the_o world_n and_o make_v the_o north_n magnetic_a pole_n to_o be_v 25_o d._n 44_o m._n from_o the_o pole_n of_o the_o world_n beside_o he_o have_v some_o thought_n of_o a_o point_n respective_a in_o the_o bowel_n of_o the_o earth_n but_o when_o i_o have_v read_v he_o and_o consider_v of_o it_o i_o think_v the_o magnetic_a pole_n may_v be_v near_o to_o the_o zenith_n of_o london_n than_o the_o pole_n of_o the_o world_n and_o that_o by_o the_o latitude_n of_o london_n and_o vaygat_n and_o their_o difference_n of_o longitude_n 58_o d._n 00_o m._n and_o the_o variation_n at_o london_n 11_o d._n 15_o m._n east_n and_o the_o variation_n at_o vaygat_n 7_o d._n 00_o m._n west_n i_o may_v find_v out_o the_o magnetical_a pole_n at_o m_n as_o in_o the_o follow_a scheme_n but_o here_o we_o must_v take_v notice_n that_o mr._n burrowes_n observation_n of_o the_o variation_n at_o vaygat_n be_v not_o the_o same_o year_n that_o he_o observe_v at_o lymehouse_n in_o october_n 1580._o but_o four_o year_n before_o as_o it_o plain_o appear_v to_o i_o by_o the_o motion_n of_o the_o magnetical_a pole_n for_o he_o be_v one_o that_o sail_v much_o into_o those_o northern_a part_n his_o observation_n of_o the_o variation_n at_o vaygat_n be_v in_o the_o year_n 1576_o and_o then_o the_o variation_n at_o london_n be_v 11_o d._n 34_o m._n but_o in_o the_o year_n 1580_o when_o it_o be_v 11_o d._n 15_o m._n at_o london_n it_o be_v 8_o d._n 38_o m._n at_o vaygat_n as_o it_o appear_v in_o the_o follow_a scheme_n for_o find_v the_o latitude_n of_o the_o pole_n we_o have_v in_o the_o triangle_n l_o p_o v_o the_o co-latitude_n of_o london_n l_o p_o 38_o d._n 28_o m._n and_o p_o v_n the_o co-latitude_n of_o vaygat_n 20_o d._n 00_o m._n and_o the_o angle_n l_o p_o v_o ferè_fw-la 58_o d._n 00_o m._n the_o difference_n of_o longitude_n between_o london_n and_o vaygat_n to_o find_v the_o side_n l_o v_n the_o distance_n between_o london_n and_o vaygat_n and_o the_o angle_n p_o l_o v_o and_o p_o v_o l_o from_o p_o l_o v_n subtract_v 11_o d._n 15_o m._n and_o there_o remain_v the_o angle_n v_o l_o m._n and_o subtract_v 8_o d._n 38_o m._n from_o p_o v_o l_o and_o there_o will_v remain_v the_o angle_n l_o v_o m._n then_o in_o the_o triangle_n l_o m_o v_o we_o have_v the_o side_n l_o v_n and_o the_o angle_n l_o m_o v_o and_o m_o v_o l_o to_o find_v the_o side_n l_o m_n and_o v_o m_o the_o distance_n of_o the_o magnetical_a pole_n from_o the_o zenith_n of_o london_n and_o the_o zenith_n of_o vaygat_n and_o last_o we_o have_v in_o two_o triangle_n viz._n plm_n and_o p_o v_o m_o two_o side_n and_o one_o angle_n include_v to_o find_v p_o m_o the_o distance_n of_o the_o magnetical_a pole_n from_o the_o pole_n of_o the_o earth_n 8_o d._n 30_o m._n the_o find_n of_o the_o motion_n of_o these_o magnetical_a pole_n be_v by_o the_o decrease_a of_o the_o variation_n which_o be_v first_o find_v to_o decrease_v by_o mr._n john_n mair_n second_o by_o mr._n edmund_n gunter_n professor_n of_o astronomy_n at_o gresham_n college_n in_o london_n three_o by_o mr._n henry_n gellibrand_n the_o next_o professor_n of_o astronomy_n after_o mr._n gunter_n four_o by_o myself_o in_o 1640._o and_o last_o by_o mr._n robert_n hooke_n and_o other_o in_o 1665._o the_o increase_n of_o it_o westerly_a as_o it_o shall_v hereafter_o be_v declare_v it_o cost_v i_o much_o time_n in_o calculation_n before_o i_o can_v satisfy_v myself_o in_o it_o before_o i_o come_v to_o declare_v the_o motion_n of_o these_o magnetic_a pole_n i_o shall_v make_v two_o query_n first_o where_o these_o pole_n be_v second_o the_o cause_n of_o their_o motion_n for_o answer_v to_o the_o first_o out_o of_o doubt_n they_o be_v in_o the_o magnetic_a sphere_n that_o environ_v or_o compass_v the_o whole_a earth_n fig._n i_o although_o we_o have_v find_v out_o that_o which_o mr._n william_n burrowes_n do_v not_o think_v of_o yet_o we_o must_v not_o forget_v he_o for_o that_o which_o he_o do_v because_o by_o his_o observation_n we_o come_v to_o find_v out_o the_o place_n of_o the_o magnetic_a pole_n as_o it_o appear_v in_o the_o scheme_n above_o their_o period_n or_o revolution_n be_v six_o hundred_o year_n which_o be_v two_o hundred_o and_o thirty_o year_n more_o than_o henry_n philip_n do_v allow_v they_o in_o the_o seaman_n calendar_n their_o yearly_a motion_n be_v six_o ten_o of_o a_o degree_n that_o be_v thirty_o six_o minute_n which_o i_o thus_o prove_v subtract_v 1580_o out_o of_o 1657_o the_o remainder_n be_v 77_o year_n which_o multiply_v by_o six_o ten_o the_o product_n will_v be_v 46_o 2_o 10_o which_o be_v the_o angle_n at_o the_o pole_n of_o the_o world_n m_o p_o l_o in_o june_n 1580._o from_o june_n