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each_o of_o the_o shine_a part_n of_o the_o comet_n seem_v to_o fill_v and_o occupy_v a_o much_o great_a space_n than_o real_o it_o do_v and_o so_o as_o it_o be_v observable_a in_o the_o milky_a way_n a_o great_a number_n of_o these_o small_a shine_a body_n though_o disperse_v at_o a_o pretty_a distance_n one_o from_o another_o yet_o by_o reason_n of_o the_o imperceptibleness_n of_o each_o of_o they_o they_o all_o seem_v to_o coalesce_v into_o a_o stream_n or_o blaze_n of_o light_n the_o brightness_n of_o which_o be_v yet_o far_o augment_v by_o a_o clear_a and_o unenlightened_a air_n and_o by_o such_o a_o part_n of_o the_o heaven_n wherein_o there_o appear_v few_o of_o the_o star_n whether_o they_o be_v great_a or_o lesser_a to_o the_o query_n of_o what_o magnitude_n the_o body_n coma_n and_o blaze_n of_o comet_n may_v be_v no_o answer_n can_v be_v give_v until_o another_o question_n be_v first_o answer_v and_o that_o be_v what_o be_v the_o place_n of_o comet_n and_o what_o be_v their_o distance_n from_o the_o earth_n it_o be_v the_o opinion_n of_o most_o modern_a writer_n before_o tycho_n brahe_n and_o kepler_n i_o know_v divers_a of_o the_o ancient_n think_v otherwise_o that_o comet_n be_v sublunary_a meteor_n draw_v up_o into_o the_o high_a region_n of_o the_o air_n and_o there_o set_v on_o sire_n and_o so_o continue_v burn_v till_o the_o meteor_n be_v consume_v and_o as_o the_o matter_n increase_v or_o waste_v so_o do_v the_o appearance_n of_o the_o comet_n but_o this_o noble_a dane_n and_o several_a other_o about_o that_o time_n find_v by_o accurate_a observation_n make_v that_o its_o parallax_n be_v less_o than_o that_o of_o the_o moon_n and_o consequent_o that_o it_o be_v far_o distant_a from_o the_o earth_n that_o it_o must_v be_v a_o body_n of_o another_o magnitude_n and_o nature_n than_o most_o before_o that_o time_n have_v imagine_v and_o therefore_o that_o it_o ought_v to_o be_v otherwise_o think_v of_o than_o the_o generality_n of_o mankind_n believe_v concern_v it_o many_o have_v be_v the_o attempt_n of_o former_a writer_n concern_v they_o to_o find_v out_o their_o parallax_n and_o whether_o from_o their_o unaccurate_a instrument_n or_o from_o their_o less_o skill_n and_o diligence_n in_o use_v they_o or_o from_o a_o imagination_n of_o the_o solidity_n and_o impenetrability_n of_o the_o celestial_a orb_n or_o from_o error_n in_o their_o calculation_n or_o from_o compare_v observation_n make_v at_o distant_a place_n one_o or_o both_o whereof_o be_v unaccurate_a or_o from_o a_o prepossession_n of_o tradition_n or_o common_a fame_n or_o from_o what_o other_o cause_n soever_o it_o be_v be_v uncertain_a but_o it_o be_v general_o conclude_v by_o they_o that_o all_o comet_n be_v sublunary_a meteor_n and_o there_o be_v not_o even_o at_o this_o day_n want_v some_o of_o the_o same_o opinion_n though_o for_o what_o reason_n i_o know_v not_o it_o will_v be_v hard_a to_o convince_v some_o of_o these_o that_o the_o opinion_n they_o have_v hitherto_o receive_v for_o good_a be_v not_o so_o because_o they_o will_v hardly_o give_v themselves_o the_o trouble_n of_o examine_v strict_o into_o the_o matter_n and_o to_o understand_v the_o nature_n of_o parallax_n and_o how_o significant_a they_o be_v in_o determine_v the_o distance_n of_o body_n from_o the_o surface_n of_o the_o earth_n to_o certain_a degree_n thereof_o beyond_o which_o by_o reason_n of_o the_o imperfection_n in_o instrument_n and_o observation_n and_o the_o exceed_a niceness_n and_o curiosity_n necessary_a they_o signify_v very_o little_a it_o be_v not_o my_o present_a design_n to_o explain_v what_o parallax_n be_v that_o i_o will_v suppose_v my_o reader_n to_o understand_v otherwise_o there_o can_v be_v no_o reason_n show_v he_o to_o convince_v he_o that_o it_o be_v possible_a to_o prove_v that_o this_o or_o that_o comet_n be_v not_o near_a than_o so_o many_o semidiameter_n of_o the_o earth_n nor_o far_o off_o than_o so_o many_o there_o be_v then_o two_o way_n by_o which_o we_o may_v come_v to_o some_o certainty_n of_o what_o distance_n a_o comet_n be_v and_o those_o be_v first_o the_o parallax_n of_o its_o diurnal_a motion_n or_o its_o parallax_n cause_v by_o the_o diurnal_a motion_n of_o the_o earth_n and_o second_o the_o parallax_n of_o its_o proper_a motion_n compare_v with_o the_o periodick_n or_o annual_a motion_n of_o the_o earth_n the_o first_o of_o these_o may_v be_v observe_v two_o way_n either_o by_o two_o observer_n at_o part_n of_o the_o earth_n very_o far_o distant_a from_o each_o other_o but_o as_o near_o as_o may_v be_v under_o the_o same_o meridian_n as_o suppose_v the_o one_o in_o london_n the_o other_o in_o st._n helen_n both_o conspire_v in_o their_o observe_n of_o the_o place_n of_o the_o comet_n among_o the_o fix_a star_n at_o the_o same_o time_n or_o second_o by_o one_o observer_n in_o the_o same_o place_n by_o observe_v the_o place_n of_o it_o among_o the_o fix_a star_n in_o its_o rise_n or_o set_v and_o in_o a_o great_a or_o if_o it_o may_v be_v its_o great_a height_n the_o noble_a tycho_n by_o very_o accurate_a observation_n of_o the_o parallax_n prove_v the_o comet_n of_o 1577._o to_o be_v above_o the_o moon_n kepler_n by_o his_o own_o observation_n prove_v that_o of_o 1607._o at_o its_o beginning_n to_o be_v four_o time_n far_o distant_a and_o i_o doubt_v not_o but_o some_o may_v have_v be_v above_o forty_o time_n far_o but_o i_o do_v not_o yet_o find_v that_o any_o observation_n have_v accurate_o determine_v that_o which_o be_v indeed_o the_o great_a help_n by_o which_o we_o be_v enable_v to_o judge_v of_o the_o nature_n and_o all_o the_o other_o accident_n and_o propriety_n of_o comet_n the_o aristotelian_a philosophy_n for_o a_o long_a time_n prevail_v make_v the_o world_n believe_v they_o to_o be_v nothing_o but_o exhalation_n from_o the_o earth_n draw_v up_o into_o the_o high_a region_n of_o the_o air._n but_o tycho_n by_o his_o observation_n of_o their_o parallax_n raise_v they_o out_o of_o that_o confinement_n but_o yet_o he_o seem_v to_o place_v they_o in_o a_o orb_n about_o the_o sun_n but_o kepler_n free_v they_o from_o that_o confinement_n and_o assign_v they_o the_o universe_n to_o expatiate_v in_o but_o none_o of_o all_o these_o do_v accurate_o prove_v the_o true_a distance_n of_o they_o their_o parallax_n be_v for_o the_o most_o part_n so_o very_o small_a that_o i_o fear_v instrument_n with_o common_a light_n will_v hardly_o reach_v they_o but_o we_o must_v expect_v from_o future_a observation_n make_v with_o telescopical_a instrument_n to_o receive_v a_o certain_a answer_n to_o this_o query_n certain_a i_o be_o that_o the_o comet_n which_o begin_v to_o appear_v in_o november_n 1664._o and_o disappear_v in_o march_n follow_v be_v far_o remove_v beyond_o the_o distance_n assign_v by_o kepler_n for_o by_o my_o own_o observation_n divers_a time_n repeat_v i_o can_v not_o find_v any_o senfible_a parallax_n though_o i_o endeavour_v by_o a_o new_a method_n to_o make_v my_o observation_n more_o accurate_a now_o though_o i_o have_v not_o the_o convenience_n of_o make_v use_n of_o a_o quadrant_n or_o any_o such_o instrument_n to_o observe_v its_o place_n when_o near_o the_o horizon_n yet_o the_o way_n i_o take_v will_v i_o think_v be_v as_o good_a which_o be_v this_o with_o a_o very_a good_a six_o foot_n perspective-glass_n or_o telescope_n i_o observe_v the_o place_n of_o the_o comet_n in_o respect_n of_o the_o adjacent_a small_a star_n as_o soon_o as_o it_o appear_v and_o so_o trace_v its_o way_n till_o it_o disappear_v in_o the_o vapour_n of_o the_o horizon_n the_o like_a i_o do_v several_a other_o day_n successive_o take_v notice_n by_o what_o degree_n in_o what_o time_n it_o make_v its_o progress_n to_o see_v whether_o by_o its_o parallax_n when_o near_o the_o horizon_n it_o will_v have_v be_v depress_v below_o that_o line_n of_o its_o motion_n which_o it_o keep_v when_o at_o a_o great_a height_n above_o it_o but_o though_o i_o try_v this_o several_a time_n yet_o i_o be_v not_o able_a to_o discern_v that_o the_o parallax_n of_o it_o cause_v either_o any_o sensible_a bend_n of_o the_o line_n or_o any_o sensible_a inequality_n in_o its_o progress_n by_o which_o i_o shall_v have_v soon_o find_v it_o than_o by_o take_v its_o altitude_n with_o common_a instrument_n though_o i_o confess_v these_o observation_n be_v make_v when_o the_o motion_n of_o the_o comet_n be_v slow_a and_o consequent_o when_o in_o probability_n it_o be_v far_o distant_a from_o the_o earth_n to_o i_o there_o seem_v no_o doubt_n but_o that_o it_o be_v a_o long_a way_n remove_v above_o the_o moon_n when_o i_o make_v these_o observation_n for_o have_v it_o be_v of_o a_o equal_a distance_n with_o that_o they_o allow_v the_o moon_n it_o must_v this_o way_n have_v manifest_v a_o very_a sensible_a
the_o motion_n of_o the_o ascend_a stream_n or_o beard_n be_v but_o slow_a there_o need_v no_o very_a quick_a supply_n of_o other_o part_n we_o see_v also_o into_o what_o a_o vast_a quantity_n of_o smoke_n a_o small_a parcel_n of_o a_o combustible_a body_n may_v be_v turn_v from_o all_o which_o particular_n it_o be_v not_o unlikely_a but_o that_o the_o comet_n may_v be_v a_o body_n move_v with_o a_o regular_a circular_a or_o elliptical_a motion_n as_o the_o planet_n be_v that_o it_o may_v be_v a_o body_n of_o such_o a_o constitution_n as_o that_o the_o fluid_a aether_n through_o which_o it_o pass_v may_v dissolve_v it_o much_o after_o the_o manner_n as_o a_o meâ—struum_fw-la such_o as_o aquafortis_n spirit_n of_o niter_n etc._n etc._n do_v a_o dissoluble_a body_n that_o by_o this_o mean_n there_o may_v be_v a_o slow_a but_o continual_a eruption_n of_o somewhat_o opacous_a part_n which_o may_v by_o their_o dissolution_n afford_v a_o sufficient_a quantity_n of_o light_a to_o make_v as_o great_a a_o appearance_n as_o any_o of_o the_o comet_n that_o this_o stream_n or_o beard_n may_v by_o the_o resistance_n of_o the_o aether_n be_v a_o little_a deflected_a back_n ward_n in_o the_o same_o manner_n as_o a_o ascend_a stream_n of_o smoke_n will_v be_v by_o the_o resistance_n of_o the_o air_n if_o the_o burn_a body_n be_v move_v this_o or_o that_o way_n through_o it_o that_o the_o body_n of_o the_o comet_n may_v be_v both_o as_o ancient_a and_o as_o lasting_a as_o the_o world_n and_o that_o this_o which_o have_v late_o appear_v may_v have_v appear_v heretofore_o and_o may_v likewise_o hereafter_o appear_v again_o that_o it_o be_v probable_a the_o near_a distance_n of_o it_o be_v much_o great_a than_o that_o of_o the_o moon_n that_o the_o length_n of_o its_o beard_n be_v long_o than_o its_o distance_n from_o the_o earth_n and_o consequent_o several_a time_n long_o than_o the_o distance_n between_o the_o earth_n and_o the_o moon_n that_o its_o visible_a way_n among_o the_o star_n be_v very_o differ_v from_o a_o great_a circle_n especial_o towards_o the_o latter_a end_n when_o it_o become_v retrograde_a that_o its_o way_n through_o the_o aether_n can_v not_o be_v suppose_v equal_a in_o a_o straight_a line_n though_o it_o may_v be_v suppose_v equal_a in_o a_o curve_v or_o circle_n that_o the_o exact_a way_n of_o it_o can_v not_o be_v certain_o determine_v by_o the_o best_a observation_n i_o have_v yet_o meet_v with_o and_o that_o therefore_o the_o best_a help_n we_o have_v to_o guess_v of_o its_o way_n and_o distance_n be_v by_o its_o manner_n of_o move_v as_o to_z appearance_n among_o the_o fix_a star_n which_o i_o have_v already_o show_v to_o be_v explicable_a by_o various_a hypothesis_n for_o both_o the_o earth_n and_o comet_n may_v be_v suppose_v to_o be_v move_v either_o both_o one_o way_n or_o contrary_a way_n or_o cross_a way_n the_o earth_n may_v be_v suppose_v to_o stand_v still_o and_o the_o comet_n only_o to_o be_v move_v and_o the_o like_a these_o requisite_n therefore_o be_v hitherto_o want_v in_o the_o observation_n i_o have_v meet_v with_o of_o this_o comet_n all_o that_o can_v be_v say_v of_o it_o will_v at_o best_a be_v but_o conjectural_a and_o hypothetical_a since_o nothing_o can_v be_v reasonable_o build_v upon_o those_o observation_n where_o the_o truth_n of_o they_o be_v dubious_a want_v therefore_o sound_a material_n to_o work_v upon_o in_o this_o comet_n i_o have_v recourse_n to_o the_o observation_n of_o the_o noble_a dane_n tycho_n brahe_n be_v sufficient_o satisfy_v both_o of_o the_o ability_n industry_n and_o veracity_n of_o that_o excellent_a author_n who_o leave_v nothing_o unattempted_a for_o the_o perfect_a of_o such_o observation_n as_o seem_v to_o he_o requisite_a for_o the_o complete_n a_o history_n of_o that_o comet_n which_o appear_v in_o 1577._o and_o from_o those_o observation_n of_o his_o i_o endeavour_v to_o trace_v the_o way_n of_o it_o according_a to_o several_a hypothesis_n and_o find_v that_o suppose_v the_o earth_n not_o to_o be_v move_v with_o a_o annual_a motion_n but_o only_o a_o diurnal_a about_o its_o own_o axis_n the_o way_n of_o comet_n will_v fall_v in_o a_o line_n very_o near_o approach_v the_o nature_n of_o a_o circle_n though_o neither_o into_o a_o exact_a circle_n nor_o a_o exact_a ellipse_n and_o therefore_o seem_v irregular_a and_o not_o at_o all_o probable_a again_o suppose_v it_o move_v about_o the_o sun_n as_o tycho_n have_v do_v we_o find_v from_o his_o calculation_n of_o it_o he_o be_v fain_o to_o allow_v it_o a_o quick_a and_o slow_a motion_n in_o its_o orbit_n to_o solve_v the_o phaenomena_n which_o seem_v to_o i_o but_o a_o shift_n that_o will_v serve_v to_o help_v out_o any_o lame_a hypothesis_n whatsoever_o and_o that_o grant_v and_o the_o parallax_n of_o the_o comet_n unknown_a i_o will_v undertake_v very_o easy_o to_o make_v out_o almost_o any_o hypothesis_n which_o be_v the_o fault_n also_o of_o mr._n horox_n his_o hypothesis_n wherein_o he_o suppose_v the_o earth_n to_o be_v move_v about_o the_o sun_n and_o the_o comet_n like_o a_o rocket_n to_o be_v shoot_v out_o of_o the_o sun_n and_o by_o degree_n to_o return_v to_o it_o again_o in_o which_o hypothesis_n indeed_o there_o seem_v to_o be_v much_o more_o reason_n for_o aninequality_n of_o motion_n though_o not_o in_o the_o manner_n as_o he_o have_v place_v it_o it_o be_v very_o rational_a that_o the_o motion_n of_o it_o at_o first_o if_o cast_v out_o of_o the_o sun_n shall_v be_v very_o swift_a but_o than_o it_o ought_v likewise_o to_o have_v accelerate_a its_o motion_n in_o the_o same_o manner_n in_o its_o return_n back_o to_o it_o again_o which_o it_o do_v not_o in_o his_o hypothesis_n for_o a_o stone_n or_o any_o other_o heavy_a body_n be_v shoot_v up_o into_o the_o air_n do_v make_v its_o return_n back_o again_o to_o the_o earth_n almost_o by_o the_o same_o degree_n of_o velocity_n by_o which_o it_o ascend_v from_o it_o almost_o i_o say_v because_o the_o resistance_n of_o the_o air_n do_v so_o far_a impede_fw-la the_o motion_n of_o the_o body_n through_o it_o that_o it_o never_o suffer_v it_o to_o acquire_v the_o same_o degree_n of_o velocity_n with_o which_o it_o be_v first_o shoot_v upward_o this_o be_v sufficient_o evident_a from_o a_o pendulum_n which_o if_o it_o be_v throw_v upward_o and_o be_v suffer_v to_o return_v back_o it_o will_v never_o rise_v again_o on_o the_o opposite_a side_n to_o a_o equal_a height_n with_o that_o it_o descend_v from_o on_o that_o side_n towards_o which_o it_o be_v throw_v but_o beside_o in_o his_o hypothesis_n he_o seem_v to_o take_v no_o notice_n at_o all_o of_o the_o latitude_n of_o the_o comet_n which_o seem_v to_o carry_v it_o much_o far_o off_o from_o the_o sun_n when_o he_o suppose_v it_o to_o be_v return_v near_o and_o indeed_o upon_o the_o whole_a his_o hypothesis_n seem_v rather_o a_o product_n of_o chance_n than_o of_o any_o contrivance_n for_o he_o in_o endeavour_v to_o set_v off_o the_o longitude_n of_o the_o comet_n according_a to_o tycho_n table_n and_o to_o trace_v its_o way_n by_o suppose_v the_o earth_n annual_a motion_n make_v use_n always_o of_o the_o same_o radius_fw-la to_o set_v off_o the_o aspect_n or_o apparent_a angle_n of_o it_o with_o the_o sun_n his_o line_n of_o chord_n he_o make_v use_v of_o do_v always_o direct_a the_o point_n of_o his_o compass_n to_o the_o place_n where_o he_o situate_v the_o comet_n as_o may_v be_v easy_o find_v by_o examine_v the_o nine_o figure_n where_o you_o may_v find_v that_o he_o place_v the_o comet_n always_o equal_o distant_a from_o the_o earth_n and_o that_o distance_n be_v always_o equal_a to_o the_o distance_n of_o the_o sun_n which_o have_v so_o many_o inconvenience_n and_o improbability_n that_o i_o shall_v not_o insist_v far_o on_o it_o especial_o since_o i_o do_v not_o find_v that_o he_o bestow_v any_o far_a pain_n in_o explicate_v or_o cultivate_v this_o his_o hypothesis_n than_o only_o the_o bare_a delineation_n of_o this_o nine_o figure_n but_o to_o return_v to_o tycho_n hypothesis_n if_o that_o be_v true_a why_o do_v not_o the_o comet_n again_o appear_v after_o a_o certain_a space_n of_o time_n and_o why_o can_v not_o he_o have_v foretell_v when_o it_o shall_v again_o appear_v as_o well_o as_o he_o can_v predict_v the_o appearance_n of_o venus_n about_o who_o orb_n he_o suppose_v it_o to_o circulate_v i_o shall_v pass_v by_o several_a other_o very_a material_a objection_n that_o may_v be_v make_v against_o that_o his_o supposition_n because_o many_o of_o they_o may_v be_v make_v also_o against_o his_o hypothefis_n of_o the_o heaven_n in_o general_a which_o i_o shall_v the_o rather_o omit_v because_o i_o do_v not_o find_v he_o have_v many_o follower_n in_o that_o supposition_n the_o generality_n of_o
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though_o in_o some_o other_o supposition_n i_o differ_v from_o he_o as_o first_o that_o the_o comet_n
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