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Examples
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He gives the last day of the fourth month as a jen-hsü day, June 20, 1 B.C., for which day Oppolzer calculates his solar eclipse no.
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Feb. 5, 2 B.C., for which day Oppolzer, Canon der Finsternisse, calculates his solar eclipse no.
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It must have been quite conspicuous in Ch'ang-an; Oppolzer charts the path of centrality as passing through the present Urga, Mongolia, and Korea.
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Hoang equates this date with Aug. 19, 134 B.C., for which day Oppolzer calculates his solar eclipse no.
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Hoang equates this day with Dec. 12, 93 B.C., for which Oppolzer calculates his solar eclipse no. 2652 and charts the moon's umbra as passing through Suiyüan and Chahar.
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The principal star of Wei3, μ Scr, was then in 219° R.A.; Oppolzer calculates the sun as in 215° long.
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Hoang equates this date with June 18, 112 B.C., for which Oppolzer calculates his solar eclipse no.
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Oppolzer charts the moon's umbra in the eclipse of Apr. 15, 136 as passing through northern Siberia; calculation by the method in Neugebauer, Astronomische Chronologie, shows that in Ch'ang-an this eclipse was invisible, in the present Peiping it reached a magnitude of 0.07 at 3: 26 p.m., local time, and at the present
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Oppolzer calculates his solar eclipse no. 2570 for Apr. 6, 127, and nothing for the other date, so that the recording in the "Treatise" is correct.
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R.A.; Oppolzer calculates the longitude of the sun at the eclipse of 141
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