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find_v where_o it_o be_v day_n and_o where_o it_o be_v night_n all_o the_o world_n over_o compose_v your_o globe_n and_o all_o people_n that_o live_v in_o the_o illuminate_v hemisphere_n enjoy_v day_n at_o that_o moment_n and_o all_o that_o live_v in_o the_o obscure_a one_o night._n operation_n viii_o to_o know_v where_o at_o that_o moment_n of_o time_n the_o inhabitant_n enjoy_v nothing_o but_o day_n and_o where_o nothing_o but_o night_n as_o also_o when_o the_o day_n and_o night_n will_v be_v thus_o perpetual_a in_o any_o place_n subject_n to_o this_o alteration_n describe_v with_o your_o eye_n a_o imaginary_a circle_n about_o the_o day_n illuminate_v pole_n its_o radius_fw-la be_v the_o distance_n from_o the_o say_a pole_n to_o the_o near_a part_n of_o the_o shade_n of_o extuberancy_n and_o all_o place_n within_o that_o circle_n will_v have_v then_o no_o night_n and_o all_o place_n within_o the_o dark_a circle_n of_o the_o like_o radius_fw-la round_o the_o obscure_v place_n or_o 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confine_n or_o extremity_n of_o the_o precede_a and_o follow_v shade_n of_o extuberancy_n you_o may_v conclude_v that_o to_o all_o the_o inhabitant_n under_o the_o first_o the_o sun_n be_v rise_v and_o to_o they_o under_o the_o second_o that_o he_o be_v then_o set_v operation_n x._o to_o find_v where_o the_o sun_n be_v vertical_a at_o any_o time_n i._n e._n what_o people_n have_v he_o just_a over_o their_o head_n the_o sun_n be_v always_o vertical_a to_o those_o that_o lie_v in_o the_o middle_n of_o the_o illuminate_v part_n of_o the_o globe_n i._n e._n to_o those_o that_o dwell_v under_o his_o then_o present_a place_n in_o his_o parallel_n therefore_o as_o i_o show_v you_o in_o the_o 11._o first_o section_n if_o you_o compose_v your_o globe_n and_o hold_v up_o your_o string_n against_o the_o sun_n from_o the_o pole_n till_o its_o shade_n pass_v through_o the_o other_o or_o from_o the_o zenith_n till_o it_o pass_v through_o the_o nadir_n it_o will_v cut_v the_o parallel_n of_o the_o 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