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£µ¡š¸É 2 „¦µ¢¦³®ªnµŠ HJD „´ Epoch š¸ÉŠœo°¥š¸É »—
( o°¤¼¨Äœ„¦°¸ÉÁ®¨¸É ¥¤‡º° o°¤¼¨ °ŠŸ¼o ª·‹´¥)
‹µ„‡nµÁª¨µš¸ÉŠœo °¥š¸É »—š¸Éŗo ‹µ„„µ¦´ŠÁ„˜„µ¦–r (O) ˜´ÊŠÂ˜n°—¸˜¦nª¤„´ Šµœª·‹´¥œ¸Ê œÎµ¤µ‡Î µœª–®µ‡nµ E
‹µ„¤„µ¦š¸É (1) ¨³®µŸ¨˜nµŠ °Š‡n µÁª¨µš¸ÉŠœo°¥š¸É »— (O-C) ‹µ„¤„µ¦š¸É (2) ¤µ¦oµŠ„¦µ¢‡ªµ¤´¤¡´ œ›r
¦³®ªn µŠ O-C „´ Epoch ŗo„¦µ¢—´Šœ¸Ê£µ¡š¸É 3
£µ¡š¸É 3 Ÿœ£µ¡ O-C °Š¦³—µª‡¼n Á°ª¸ š°¦¸
( o°¤¼¨Äœ„¦°¸ÉÁ®¨¸¥¤‡º ° o°¤¼¨ °ŠŸ¼o ª·‹´ ¥)
O-C = (-1.485040r0.629397)x10-10E2 + (2.03507r1.134)x10-6E + (67.9r3.98)x10-4 (2)