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end_n island_n north_n south_n 2,551 5 10.0698 5 true
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ID Title Author Corrected Date of Publication (TCP Date of Publication) STC Words Pages
A34005 The sector on a quadrant, or A treatise containing the description and use of four several quadrants two small ones and two great ones, each rendred many wayes, both general and particular. Each of them accomodated for dyalling; for the resolving of all proportions instrumentally; and for the ready finding the hour and azimuth universally in the equal limbe. Of great use to seamen and practitioners in the mathematicks. Written by John Collins accountant philomath. Also An appendix touching reflected dyalling from a glass placed at any reclination. Collins, John, 1625-1683.; Lyon, John, professor of mathematics. Appendix touching reflective dialling.; Sutton, Henry, mathematical instrument maker. 1659 (1659) Wing C5382; ESTC R32501 226,510 415

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7_o 18_o n_o 2_o the_o wagoner_n 5_o 39_o 44_o 56_o n_o 2_o bright_a foot_n of_o the_o twin_n 6_o 18_o 16_o 39_o n_o 3_o great_a dog_n 6_o 30_o 16_o 13_o saint_n 1_o castor_n or_o apollo_n 7_o 12_o 32_o 30_o n_o 2_o the_o little_a dog_n 7_o 22_o 6_o 6_o n_o 2_o pollux_n or_o hercules_n 7_o 24_o 28_o 48_o n_o 2_o hidra_n heart_n 9_o 10_o 7_o 10_o saint_n 1_o lion_n heart_n 9_o 50_o 13_o 39_o n_o 1_o lion_n neck_n 9_o 50_o 21_o 41_o n_o 3_o great_a bear_n rump_n 10_o 40_o 58_o 43_o n_o 2_o lion_n back_o 11_o 30_o 22_o 4_o n_o 2_o lion_n tail_n 11_o 31_o 16_o 30_o n_o 1_o the_o virgin_n girdle_n 12_o 38_o 5_o 20_o n_o 3_o first_o in_o the_o great_a bear_n tail_n next_o the_o rump_n 12_o 38_o 57_o 51_o n_o 2_o vindemiatrix_n 12_o 44_o 15_o 51_o n_o 3_o virgin_n spike_n 13_o 7_o 9_o 19_o saint_n 1_o middlemost_a in_o the_o great_a bear_n tail_n 13_o 10_o 56_o 45_o n_o 2_o last_o in_o the_o end_n of_o the_o great_a bear_n tail_n 13_o 34_o 51_o 05_o n_o 2_o arcturus_n 14_o 00_o 21_o 03_o n_o 1_o south_n ballance_n 14_o 32_o 14_o 33_o saint_n 2_o bright_a in_o the_o crown_n 15_o 24_o 27_o 43_o n_o 3_o north_n ballance_n 14_o 58_o 08_o 03_o saint_n 3_o serpentary_n leave_v hand_n 15_o 56_o 02_o 46_o saint_n 3_o scorpion_n heart_n 16_o 08_o 25_o 35_o saint_n 1_o serpentary_n leave_v knee_n 16_o 18_o 09_o 46_o saint_n 3_o serpentary_n right_a knee_n 16_o 49_o 15_o 12_o saint_n 3_o hercules_n head_n 16_o 59_o 14_o 51_o n_o 3_o serpentary_n head_n 17_o 19_o 12_o 52_o n_o 3_o dragon_n head_n 17_o 48_o 51_o 36_o n_o 3_o bright_a in_o the_o harp_n 18_o 25_o 38_o 30_o n_o 1_o eagle_n or_o vulture_n heart_n 19_o 34_o 08_o 00_o n_o 2_o upper_a horn_n of_o capricorn_n 19_o 58_o 13_o 32_o saint_n 3_o swan_n tail_n 20_o 30_o 44_o 05_o n_o 2_o left_a shoulder_n of_o aquarius_n 21_o 13_o 07_o 02_o saint_n 3_o pegasus_n mouth_n 21_o 27_o 08_o 19_o n_o 3_o right_a shoulder_n of_o aquarius_n 21_o 48_o 01_o 58_o saint_n 3_o fomahant_n 22_o 39_o 31_o 17_o saint_n 1_o pegasus_n upper_a wing_n 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17_o 47_o 20_o 20_o 54_o 17._o 30_o 21_o 20_o 58_o 17_o 13_o 22_o 21_o 03_o 16_o 56_o 23_o 21_o 07_o 16_o 39_o 24_o 21_o 11_o 16_o 21_o 25_o 21_o 15_o 16_o 03_o 26_o 21_o 19_o 15_o 44_o 27_o 21_o 23_o 15_o 26_o 28_o 21_o 27_o 15_o 07_o 29_o 21_o 31_o 14_o 48_o 30_o 21_o 35_o 14_o 28_o 31_o 21_o
night_n and_o the_o difference_n between_o 90_o and_o either_o of_o those_o ark_n be_v the_o ascensional_a difference_n or_o time_n of_o rise_v and_o set_v from_o 6._o to_o find_v the_o azimuth_n general_o the_o proportion_n for_o this_o purpose_n have_v be_v deliver_v before_o from_o which_o it_o may_v be_v observe_v that_o there_o be_v no_o two_o term_n fix_v and_o therefore_o to_o every_o altitude_n the_o contain_v side_n of_o the_o triangle_n namely_o the_o compliment_n both_o of_o the_o altitude_n and_o latitude_n must_v be_v sum_v and_o difference_v when_o the_o proposition_n be_v to_o be_v perform_v on_o this_o line_n sole_o and_o the_o operation_n will_v be_v after_o the_o same_o manner_n as_o for_o the_o hour_n namely_o with_o a_o parallel_n entrance_n and_o this_o be_v all_o i_o shall_v say_v of_o the_o author_n general_a way_n and_o of_o any_o other_o that_o he_o use_v i_o never_o hear_v of_o those_o way_n that_o follow_v be_v of_o my_o own_o supply_n by_o help_v of_o this_o 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the_o say_v 20d._o this_o line_n sol_n be_v make_v use_n of_o by_o m._n foster_n in_o his_o scale_n for_o dyall_v the_o line_n of_o verse_v sin_n be_v place_v on_o the_o left_a edge_n of_o the_o foreside_n of_o the_o quadrant_n for_o the_o ready_a take_v out_o the_o difference_n of_o the_o verse_v sin_n of_o any_o two_o ark_n and_o to_o measure_v a_o difference_n of_o two_o verse_v sin_n upon_o it_o which_o be_v the_o chief_a use_n i_o shall_v make_v of_o it_o whereas_o to_o operate_v single_o upon_o it_o it_o will_v be_v more_o convenient_a for_o the_o hand_n to_o have_v it_o lie_v on_o the_o right_a edge_n of_o the_o quadrant_n a_o example_n for_o find_v the_o azimuth_n general_o by_o help_n of_o verse_v sin_n in_o the_o limb_n and_o of_o other_o line_n on_o the_o quadrant_n i_o shall_v rehearse_v the_o proportion_n as_o the_o cousin_n of_o the_o latitude_n be_v to_o the_o secant_fw-la of_o the_o altitude_n or_o as_o the_o cousin_n of_o the_o altitude_n be_v to_o the_o secant_fw-la of_o the_o latitude_n so_o be_v the_o difference_n of_o the_o verse_v sin_n of_o the_o sun_n distance_n from_o the_o elevate_v pole_n and_o of_o the_o ark_n of_o difference_n between_o the_o latititude_n and_o altitude_n to_o the_o verse_v sine_fw-la of_o the_o azimuth_n from_o the_o midnight_n meridian_n and_o make_v the_o latter_a clause_n of_o the_o three_o term_v the_o compliment_n of_o the_o sum_n of_o the_o latitude_n and_o altitude_n to_o a_o semicircle_n the_o proportion_n will_v find_v the_o verse_v sine_fw-la of_o the_o azimuth_n from_o the_o noon_n meridian_n example_n altitude_n 51_o 32′_n latitude_n 34_o 32_o compliment_n 55_o 2d_o difference_n 17_o 00_o ☉_o distance_n from_o elevate_a pole_n 66_o 29_o operation_n in_o the_o first_o term_n of_o the_o proportion_n on_o the_o line_n of_o verse_v sin_n take_v the_o distance_n between_o 17_o and_o 66_o 29′_n and_o enter_v it_o twice_o down_o the_o line_n of_o sines_n from_o the_o centre_n take_v the_o near_a distance_n to_o the_o thread_n lay_v over_o the_o secant_fw-la of_o 51_o 32′_n the_o give_v altitude_n and_o enter_v one_o foot_n of_o this_o extent_n at_o the_o sine_fw-la of_o 55_o 28′_n the_o compliment_n of_o the_o latitude_n lay_v the_o thread_n to_o the_o other_o foot_n according_a to_o near_a distance_n and_o in_o the_o line_n of_o verse_v sin_n in_o the_o limb_n it_o will_v lie_v over_o 95_o for_o the_o sun_n azimuth_n from_o the_o midnight_n meridian_n and_o the_o sun_n declination_n suppose_v the_o same_o he_o shall_v have_v the_o like_a azimuth_n from_o the_o north_n in_o our_o latitude_n of_o london_n when_o his_o altitude_n be_v 34_o 32′_n for_o the_o side_n of_o the_o triangle_n be_v the_o same_o another_o example_n to_o find_v it_o in_o the_o verse_v sine_fw-la of_o 90_o latitude_n 47_o 27′_n altitude_n 51_o 32_o sum_n 98_o 59_o compliment_n 81_o 1_o polar_a distance_n 66_o 29_o take_v the_o distance_n in_o the_o line_n of_o sines_n as_o represent_v the_o former_a half_n of_o a_o line_n of_o verse_v sin_n between_o these_o two_o ark_n count_v towards_o the_o centre_n viz._n 66_o 29′_n and_o 81_o 01′_n and_o enter_v this_o extent_n twice_o down_o the_o line_n of_o sines_n from_o the_o centre_n and_o take_v the_o near_a distance_n to_o the_o thread_n lie_v over_o the_o secant_fw-la of_o the_o latitude_n 47_o 27′_n then_o enter_v one_o foot_n of_o this_o extent_n at_o 51_o 32′_n count_v from_o the_o end_n of_o the_o sin_n towards_o the_o centre_n lay_v the_o thread_n to_o the_o other_o foot_n according_a to_o near_a distance_n and_o in_o the_o verse_v sine_fw-la of_o 90_o it_o show_v the_o azimuth_n to_o be_v 65_o from_o the_o south_n in_o this_o our_o northern_a hemispere_n of_o the_o fit_v particular_a scale_n and_o the_o line_n of_o entrance_n thereto_o belong_v this_o scale_n serve_v to_o find_v both_o the_o hour_n and_o azimuth_n in_o the_o latitude_n of_o london_n to_o which_o it_o be_v fit_v in_o the_o equal_a limb_n by_o a_o lateral_a or_o positive_a entrance_n it_o consist_v of_o two_o line_n of_o sines_n the_o great_a be_v 62_o of_o a_o sine_fw-la as_o large_a as_o can_v stand_v upon_o the_o quadrant_n the_o radius_fw-la of_o the_o lesser_a sine_fw-la be_v make_v equal_a to_o 51_o 32′_n of_o this_o great_a be_v fit_v to_o the_o latitude_n the_o scale_n of_o entrance_n stand_v within_o the_o projection_n and_o abut_a on_o the_o line_n of_o sines_n be_v no_o other_o but_o a_o portion_n of_o a_o line_n of_o sines_n who_o radius_fw-la be_v make_v equal_a to_o 38_o 28′_n of_o the_o great_a sine_fw-la of_o the_o fit_a scale_n and_o this_o scale_n of_o entrance_n be_v number_v by_o its_o compliment_n up_o to_o 62_o as_o much_o as_o be_v the_o suns-great_a meridian_n altitude_n in_o this_o latitude_n the_o ground_n of_o this_o scale_n be_v derive_v from_o the_o diagonal_a scale_n the_o length_n whereof_o bear_v such_o proportion_n to_o the_o line_n of_o sines_n whereto_o it_o be_v fit_v as_o the_o secant_fw-la of_o the_o particular_a latitude_n do_v to_o the_o radius_fw-la which_o be_v the_o same_o that_o the_o radius_fw-la bear_v to_o the_o cousin_n of_o the_o latitude_n and_o consequent_o make_v the_o line_n of_o sines_n to_o represent_v the_o fit_a scale_n the_o radius_fw-la of_o that_o sine_fw-la whereto_o it_o be_v fit_v must_v be_v equal_a to_o the_o cousin_n of_o the_o latitude_n and_o so_o we_o need_v no_o particular_a scale_n but_o this_o will_v remove_v the_o particular_a scale_n or_o scale_n of_o entrance_n near_a the_o centre_n and_o will_v not_o have_v be_v so_o ready_a as_o this_o fit_a scale_n however_o hence_o i_o may_v educe_v a_o general_a method_n for_o find_v the_o hour_n and_o azimuth_n in_o the_o limb_n without_o tangent_n or_o secant_v the_o first_o work_n will_v be_v
azimuth_n shall_v be_v 9_o 28′_n from_o the_o vertical_a at_o the_o hour_n of_o 6_o in_o our_o latitude_n of_o london_n another_o example_n to_o find_v the_o time_n when_o the_o sun_n will_v be_v due_a east_n or_o west_n extend_v the_o thread_n over_o the_o latitude_n in_o the_o semicircle_n and_o over_o the_o declination_n on_o the_o diameter_n and_o in_o the_o quadrant_n of_o latitude_n it_o show_v the_o ark_n seek_v the_o proportion_n wrought_v be_v as_o the_o radius_fw-la to_o the_o cotangent_fw-la of_o the_o latitude_n so_o be_v the_o tangent_fw-la of_o the_o declination_n to_o the_o sine_fw-la of_o the_o hour_n from_o 6._o example_n so_o when_o the_o sun_n have_v 15_o of_o north_n declination_n in_o our_o latitude_n of_o london_n the_o hour_n will_v be_v find_v 12_o 18′_n from_o 6_o in_o time_n 49⅕′_n past_o 6_o in_o the_o morning_n or_o before_o it_o in_o the_o afternoon_n another_o example_n to_o find_v the_o time_n of_o sun_n rise_v as_o the_o cotangent_fw-la of_o the_o latitude_n to_o radius_fw-la so_o be_v the_o tangent_fw-la of_o the_o declination_n to_o the_o sine_fw-la of_o the_o hour_n from_o 6_o before_o or_o after_o it_o lay_v the_o thread_n to_o the_o compliment_n of_o the_o latitude_n in_o the_o semicircle_n and_o over_o the_o declination_n on_o the_o diameter_n and_o in_o the_o quadrant_n of_o latitude_n it_o show_v the_o time_n seek_v in_o degree_n to_o be_v convert_v into_o common_a time_n by_o allow_v 15_o to_o a_o hour_n and_o 4′_n to_o a_o degree_n so_o in_o the_o latitude_n of_o london_n 51_o 32′_n when_o the_o sun_n have_v 15_o of_o declination_n the_o ascensional_a difference_n or_o time_n of_o rise_v from_o 6_o will_v be_v 19_o 42′_n to_o be_v convert_v into_o common_a time_n as_o before_o by_o what_o have_v be_v say_v it_o appear_v that_o the_o hour_n and_o azimuth_n may_v be_v find_v general_o by_o help_n of_o this_o circle_n and_o diameter_n for_o the_o performance_n whereof_o we_o must_v have_v recourse_n to_o the_o proportion_n deliver_v in_o page_n 123._o whereby_o we_o may_v always_o find_v the_o two_o angle_n adjacent_a to_o the_o side_n on_o which_o the_o perpendicular_a fall_v which_o may_v be_v any_o side_n at_o pleasure_n for_o after_o the_o first_o proportion_n whole_o in_o tangent_n be_v wrought_v to_o find_v either_o of_o those_o angles_n will_v be_v agreeable_a to_o the_o second_o case_n of_o right_n angle_v spherical_a triangle_n wherein_o there_o will_v be_v give_v the_o hypotenusal_a and_o one_o of_o the_o leg_n to_o find_v the_o adjacent_a angle_n only_o it_o must_v be_v suggest_v that_o when_o the_o two_o side_n that_o subtend_v the_o angle_n seek_v be_v together_o great_a than_o a_o semicircle_n recourse_n must_v be_v have_v to_o the_o opposite_a triangle_n if_o both_o those_o angles_n be_v require_v to_o be_v find_v by_o this_o trigonometry_n otherwise_o one_o of_o they_o and_o the_o three_o angle_n may_v be_v find_v by_o those_o direction_n by_o let_v fall_n the_o perpendicular_a on_o another_o side_n provide_v the_o sum_n of_o the_o side_n subtend_v those_o angles_n be_v not_o also_o great_a than_o a_o semicircle_n or_o have_v first_o find_v one_o angle_n the_o rest_n may_v be_v find_v by_o proportion_n in_o sines_n only_o in_o the_o triangle_n ☉_o z_o p_o if_o it_o be_v require_v to_o find_v the_o angle_n at_o z_o and_o ☉_o because_o the_o sum_n of_o the_o side_n ☉_o p_o and_o z_o p_o be_v less_o than_o a_o semicircle_n they_o may_v be_v both_o find_v by_o make_v the_o half_a of_o the_o base_a ☉_o z_o the_o first_o term_n in_o the_o proportion_n and_o then_o because_o the_o angle_n ☉_o z_o be_v of_o a_o different_a affection_n the_o perpendicular_a will_v fall_v without_o on_o the_o side_n ☉_o z_o continue_v towards_o b_o as_o will_v be_v evince_v by_o the_o proportiod_n for_o the_o four_o ark_n discover_v will_v be_v find_v great_a than_o the_o half_a of_o ☉_o z_o hence_o we_o derive_v the_o cannon_n in_o page_n 124_o for_o find_v the_o 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