ҧѹҧ׹

            ҧѹҧ׹Դ鹨ҡعͺͧͧšҡȵѹѧȵѹ͡ ҹѹѺʧҷԵ ҧѹ дҹçѺʧҷԵ ҧ׹

Ҿ 1 ᡹ͧš§ 23.5 з⤨ͺǧҷԵ

            觾ԡѴǧ (Longitude) ˹- ͡ 360 ͧԨٴ 0 Ӻ չԪ (Greenwich) ѧ йѺ价ҧѹ͡еѹҧ 180 ͧ ѹ ͧԨٴ 1 - 180 ѹ͡ ͧԨٴ 1 - 180ѹ ͹ 360 ô 24 ͧԨٴ 180 ѹ͡ ͧԨٴ 180 ѹ ǡѹ¡ ѹҡŔ International Date Line (˹ҷҧͧ͢Ҿ 2) ҡԹҧѹҡȵѹ͡ѧȵѹ ѹ˹ѹ Թҧѹҡȵѹѧȵѹ͡ ѹŴŧ˹ѹ
            ͧԨٴ դᵡҧѹ 15 ͧ ҵðҹͧ¶ͧԨٴ 105 ѹ͡ (ѧѴغҪҹ) ֧ǡ ҡŔ (Universal Time ¹ UT) ҷӺšչԪ 7 (105/15 = 7) ҵðҹ¨֧դҡѺ UT+7
紤ͧ
            š⤨ͺǧҷԵ˹ͺ 1 365 ѹ
            ˹觻 ͡ 12 ͹ 30 31 ѹ ʹͧѺ͹ҧѹä 觴ǧѹ⤨ͺš˹ͺһҳ 30 ѹ
            šعͺͧ˹ͺ 1 ѹ 24 Ъж١͡ 60 ҷ йҷն١ա 60 Թҷ
Ҿ 2 Ἱʴ⫹Ңͧš (Time Zone)

ҧ 1
: ѹ 24 Ҥ 18:30 UT. ҵðҹͧ¨ ҵðҹ = 18:30 + 7:00 = 25:30 ͺ: ҵðҹͧ¨ ѹ 25 ԧҤ 01:30 ԡ ҧ 2
: ѹ 2 Ҥ 08:00 . ͧ (UT+7)Դҡ (UT = 0) һǡҡ = 7 - 0 = 7 ͺ: ҡŨ ѹ 2 Ҥ 01:00 UT (08:00 07:00)
ҧ 3
: ѹ 2 Ҥ 08:00 . ͧ (UT+7) çѺâͧȭ (UT+9) һȭǡһ = 9 - 7 = 2 ͺ: ҷȭ蹨 ѹ 2 ԧҤ 06:00 . (08:00 02:00)
ҧ 4
: ѹ 2 Ҥ 08:00 . ͧ (UT+7) çѺ÷اͪԧѹ ի (UT-5) һǡҷاͪԧѹ ի = (+7) - (-5) = 12 ͺ: ҷاͪԧѹի ѹ 1 Ҥ 20:00 . (24:00 + 08:00 12:00)