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end_n north_n side_n south_n 2,400 5 9.1749 5 true
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ID Title Author Corrected Date of Publication (TCP Date of Publication) STC Words Pages
A64223 The semicircle on a sector in two books. Containing the description of a general and portable instrument; whereby most problems (reducible to instrumental practice) in astronomy, trigonometry, arithmetick, geometry, geography, topography, navigation, dyalling, &c. are speedily and exactly resolved. By J. T. Taylor, John, 1666 or 7-1687. 1667 (1667) Wing T533B; ESTC R221720 52,688 153

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be_v 13_o deg_n 30_o min._n probl._n 8._o the_o declination_n give_v to_o find_v the_o beginning_n and_o end_n of_o twilight_n or_o daybreak_n lay_v the_o thread_n to_o the_o declination_n count_v the_o contrary_a way_n as_o in_o the_o last_o problem_n and_o take_v from_o your_o scale_n of_o altitude_n 18_o deg_n for_o twilight_n and_o 13_o deg_n for_o daybreak_n or_o clear_a light_n with_o this_o run_v one_o point_n of_o the_o compass_n along_o the_o line_n of_o hour_n on_o that_o side_n next_o the_o end_n until_o the_o other_o will_v just_o touch_v the_o thread_n and_o then_o the_o former_a point_n give_v the_o respective_a time_n require_v ex._n gr_n at_o 7_o deg_n north_n declination_n day_n break_v 8_o minute_n before_o 4_o but_o twilight_n be_v 3_o hour_n 12_o minute_n in_o the_o morning_n or_o 8_o hour_n 52_o minute_n afternoon_n probl._n 9_o the_o declination_n and_o altitude_n of_o the_o sun_n or_o any_o star_n give_v to_o find_v their_o azimuth_n in_o northern_a declination_n 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style_n height_n above_o the_o substile_a as_o the_o radius_fw-la be_v to_o the_o cousin_n of_o the_o latitude_n so_o be_v the_o cousin_n of_o declination_n to_o the_o sine_fw-la of_o the_o style_n height_n to_o find_v the_o substyles_n distance_n from_o the_o meridian_n as_o the_o radius_fw-la be_v to_o the_o sine_fw-la of_o declination_n so_o be_v the_o co-tangent_a of_o the_o latitude_n to_o the_o tangent_fw-la of_o the_o substyle_n from_o the_o meridian_n to_o find_v the_o angle_n of_o twelve_o and_o six_o as_o the_o co-tangent_a of_o the_o latitude_n be_v to_o the_o radius_fw-la so_o be_v the_o sine_fw-la of_o declination_n to_o the_o co-tangent_a of_o six_o from_o twelve_o to_o find_v the_o inclination_n of_o meridian_n as_o the_o sine_fw-la of_o the_o latitude_n be_v to_o the_o radius_fw-la so_o be_v the_o tangent_fw-la of_o declination_n to_o the_o tangent_fw-la of_o inclination_n of_o meridian_n 6._o all_o north_n decliner_n with_o centre_n have_v the_o angular_a point_n of_o 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horizontalnext_v the_o coast_n of_o declination_n  _fw-fr  _fw-fr below_o in_o north_n recliner_n this_o meridian_n be_v 12._o at_o midnight_n  _fw-fr equal_a to_o a_o equinoctial_a the_o meridian_n descend_v below_o the_o horizontal_n at_o that_o end_n contrary_a to_o the_o coast_n of_o declination_n and_o the_o substyle_n lie_v in_o the_o hour_n line_n of_o six_o  _fw-fr  _fw-fr south_n incliner_n more_o than_o a_o equinoctial_a the_o meridian_n lie_v below_o that_o end_n of_o the_o horizontal_a contrary_n to_o the_o declination_n  _fw-fr  _fw-fr above_o in_o south_n incliner_n this_o meridian_n be_v only_o useful_a for_o draw_v the_o dial_n and_o place_v the_o substyle_n for_o the_o hour_n line_n must_v be_v draw_v through_o the_o centre_n to_o the_o low_a side_n after_o you_o have_v by_o the_o former_a proportion_n and_o rule_v find_v the_o new_a latitude_n new_a declination_n the_o angle_n and_o situation_n of_o the_o meridian_n your_o first_o business_n in_o delineat_v of_o the_o 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line_n of_o second_o continue_v unto_o 60_o and_o mark_v at_o the_o end_n se._n next_o to_o the_o outward_a edge_n on_o the_o fix_a and_o movable_a piece_n which_o be_v best_a discern_v when_o those_o piece_n be_v open_v to_o the_o full_a length_n be_v a_o line_n of_o meridian_n divide_v to_o 85_o who_o use_n be_v for_o navigation_n in_o describe_v map_n or_o chart_n etc._n etc._n in_o the_o vacant_a space_n you_o may_v have_v a_o line_n of_o chord_n sin_n and_o tangent_n to_o any_o radius_fw-la the_o space_n will_v bear_v and_o what_o other_o any_o one_o think_v best_a of_o as_o a_o line_n of_o latitude_n and_o hour_n etc._n etc._n on_o the_o proportional_a side_n of_o the_o loose_a piece_n be_v line_n for_o measure_v all_o manner_n of_o solid_n as_o timber_n stone_n etc._n etc._n likewise_o for_o gage_v of_o vessel_n either_o in_o wine_n or_o ale_n measure_n on_o the_o outward_a ledge_n of_o the_o movable_a and_o fix_a piece_n both_o which_o in_o use_n must_v be_v stretch_v out_o to_o the_o full_a length_n be_v a_o line_n of_o artificial_a number_n sin_n tangent_n and_o verse_v sin_n the_o first_o mark_v n_o the_o second_o saint_n the_o three_o t_n the_o four_o we_o on_o the_o inward_a ledge_n of_o the_o movable_a piece_n be_v a_o line_n of_o 12_o inch_n divide_v into_o half_n quarter_n half-quarter_n next_o to_o that_o be_v a_o prick_v line_n who_o use_n be_v for_o compute_v of_o weight_n and_o carriage_n last_o a_o line_n of_o foot_n measure_n or_o a_o foot_n divide_v into_o ten_o part_n and_o each_o of_o those_o subdivide_v into_o ten_o or_o twenty_o more_o on_o the_o inward_a ledge_n of_o the_o loose_a piece_n you_o may_v have_v a_o line_n of_o circumference_n diameter_n square_a equal_a and_o square_v inscribe_v there_o will_v still_o be_v requisite_a sight_n a_o thread_n and_o plummet_n and_o if_o any_o go_v to_o the_o price_n of_o a_o slide_a index_n to_o find_v the_o shadow_n from_o the_o plain_n perpendicular_a in_o order_n to_o take_v a_o plain_n declination_n and_o have_v a_o staff_n and_o a_o ballsocket_n the_o instrument_n be_v complete_v with_o its_o furniture_n proceed_v we_o now_o to_o the_o use_n only_o note_n by_o the_o way_n that_o mr._n brown_n have_v for_o conveniency_n of_o carry_v a_o pair_n of_o compass_n pen_n ink_n and_o pencil_n contrive_v the_o fix_a piece_n and_o movable_a both_o to_o be_v hollow_a and_o then_o the_o piece_n that_o cover_v those_o hollow_n do_v one_o supply_n the_o place_n of_o the_o loose_a piece_n for_o take_v altitude_n the_o other_o be_v a_o slide_a rule_n for_o measure_v solid_n and_o gage_v vessel_n without_o compass_n chap._n ii_o some_o use_n of_o the_o quadrantal_a side_n of_o the_o instrument_n probl._n 1._o to_o find_v the_o altitude_n of_o the_o sun_n or_o any_o star_n hang_v the_o thread_n and_o plummet_n upon_o the_o pin_n at_o the_o begin_n of_o the_o line_n of_o sin_n on_o the_o fix_a piece_n and_o have_v two_o sight_n in_o two_o hole_n parallel_v to_o that_o line_n raise_v the_o end_n of_o the_o fix_a piece_n towards_o the_o sun_n until_o the_o ray_n pass_v through_o the_o sight_n but_o when_o the_o sun_n be_v in_o a_o cloud_n or_o you_o take_v the_o altitude_n of_o any_o star_n look_v along_o the_o outward_a ledge_n of_o the_o fix_a piece_n until_o it_o be_v even_o with_o the_o middle_n of_o the_o sun_n or_o star_n then_o on_o the_o limb_n the_o thread_n cut_v the_o degree_n of_o altitude_n if_o you_o reckon_v from_o 0_o 60_o on_o the_o loose_a piece_n towards_o the_o head_n of_o the_o movable_a piece_n probl._n 2._o the_o day_n of_o the_o month_n give_v to_o find_v the_o sun_n place_n declination_n ascensional_a difference_n or_o time_n of_o rise_v and_o set_v with_o his_o right_a ascension_n the_o thread_n lay_v to_o the_o day_n of_o the_o month_n give_v the_o sun_n place_n in_o the_o line_n of_o sign_n reckon_v according_a to_o the_o order_n of_o the_o month_n viz._n forward_o from_o march_n the_o 10_o to_o june_n then_o backward_o to_o december_n and_o forward_o again_o to_o march_v 10._o in_o the_o limb_n you_o have_v the_o sun_n declination_n reckon_v from_o 60_o 0_o on_o the_o movable_a piece_n towards_o the_o head_n for_o north_n towards_o the_o end_n for_o south_n declination_n again_o on_o the_o line_n of_o right_a ascension_n the_o thread_n show_v the_o sun_n right_a ascension_n in_o degree_n or_o hour_n according_a to_o the_o make_n of_o your_o line_n count_v from_o aries_n towards_o the_o head_n and_o so_o back_o again_o according_a to_o the_o course_n of_o the_o sign_n unto_o 24_o hour_n or_o 360_o degree_n last_o on_o the_o line_n of_o hour_n you_o have_v the_o time_n of_o sun_n rise_v and_o set_v which_o turn_v into_o degree_n for_o the_o time_n from_o six_o give_v the_o ascensional_a difference_n ex._n gr_n in_fw-ge lat_fw-ge 52._o deg_n 30_o min._n for_o which_o latitude_n i_o shall_v make_v all_o the_o example_n the_o 22_o day_n of_o march_n i_o lay_v the_o thread_n to_o the_o day_n in_o the_o month_n and_o find_v it_o cut_v in_o the_o sign_n 12_o deg_n 20_o min._n for_o the_o sun_n place_n on_o the_o limb_n 4_o deg_n 43_o min._n for_o the_o sun_n declination_n north._n in_o the_o line_n of_o right_a ascension_n it_o give_v 46_o min._n of_o time_n or_o 11_o deg_n 30_o min._n of_o the_o circle_n last_o on_o the_o line_n of_o hour_n it_o show_v 28_o min._n before_o six_o for_o the_o sun_n rise_v or_o which_o be_v all_o 7_o deg_n for_o his_o ascensional_a difference_n probl._n 3_o the_o declination_n of_o the_o sun_n or_o any_o star_n give_v to_o find_v their_o amplitude_n take_v the_o declination_n from_o the_o scale_n of_o altitude_n with_o this_o distance_n set_v one_o point_n of_o your_o compass_n at_o 90_o on_o the_o line_n of_o azimuth_n apply_v the_o other_o point_n to_o the_o same_o line_n it_o give_v the_o amplitude_n count_v from_o 90_o ex._n gr_n at_o 10_o deg_n declination_n the_o amplitude_n be_v 16_o deg_n 30_o min._n at_o 20_o deg_n declination_n the_o amplitude_n be_v 34_o deg_n probl._n 4._o the_o right_a ascension_n of_o the_o sun_n with_o his_o ascensional_a difference_n give_v to_o find_v the_o oblique_a ascension_n in_o northern_a declination_n the_o difference_n betwixt_o the_o right_a ascension_n and_o ascensional_a difference_n be_v the_o oblique_a ascension_n in_o southern_a declination_n take_v the_o sum_n of_o they_o for_o the_o oblique_a ascension_n ex._n gr_n at_o 11_o deg_n 30_o sec._n right_a ascension_n and_o 6_o deg_n 30_o sec._n ascensional_a difference_n in_o northern_a declination_n the_o oblique_a ascension_n will_v be_v 5_o deg_n in_o southern_a 18_o deg_n probl._n 5._o the_o sun_n altitude_n and_o declination_n or_o the_o day_n of_o the_o month_n give_v to_o find_v the_o hour_n take_v the_o sun_n altitude_n from_o the_o scale_n of_o altitude_n and_o lay_v the_o thread_n to_o the_o declination_n in_o the_o limb_n or_o which_o be_v all_o one_o to_o the_o day_n in_o the_o month_n move_v one_o point_n of_o the_o compass_n along_o the_o line_n of_o hour_n on_o that_o side_n the_o thread_n next_o the_o end_n until_o the_o other_o point_n just_a touch_n the_o thread_n then_o the_o former_a point_n show_v the_o hour_n but_o whether_o it_o be_v before_o or_o after_o noon_n be_v leave_v to_o your_o judgement_n to_o determine_v ex._n gr_n the_o 22_o day_n of_o march_n or_o 4_o deg_n 43_o min._n north_n declination_n and_o 20_o deg_n altitude_n the_o hour_n be_v either_o 47_o minute_n past_o 7_o in_o the_o morning_n or_o 13_o minute_n past_o 4_o afternoon_n probl._n 6._o the_o declination_n of_o the_o sun_n or_o day_n of_o the_o month_n and_o hour_n give_v to_o find_v the_o altitude_n lay_v the_o thread_n to_o the_o day_n or_o declination_n and_o take_v the_o least_o distance_n from_o the_o hour_n to_o the_o thread_n this_o apply_v to_o the_o line_n of_o altitude_n give_v the_o altitude_n require_v ex._n gr_n the_o 5_o day_n of_o april_n or_o 10_o deg_n declination_n north_n at_o 7_o in_o the_o morning_n or_o 5_o afternoon_n the_o altitude_n will_v be_v 17_o deg_n 10_o sec._n and_o better_o probl._n 7._o the_o declination_n and_o hour_n of_o the_o night_n give_v to_o find_v the_o sun_n depression_n under_o the_o horizon_n lay_v the_o thread_n to_o the_o declination_n on_o the_o limb_n but_o count_v the_o contrary_a way_n viz._n from_o 60_o 0_o on_o the_o movable_a piece_n towards_o the_o head_n for_o southern_a and_o towards_o the_o end_n for_o northern_a declination_n this_o do_v take_v the_o near_a distance_n from_o the_o hour_n to_o the_o thread_n and_o apply_v it_o to_o the_o line_n of_o altitude_n you_o have_v the_o degree_n of_o the_o sun_n depression_n ex._n gr_n at_o 5_o deg_n northern_a declination_n &_o 8_o hour_n afternoon_n the_o depression_n