分至圈
蓝色 = 二至圈
H = 二至圈
二分圈
[编辑]二分圈是在天球上的子午线，它通过天球的南北极和两个分点：白羊宫第一点和天平宫第一点。
二至圈
[编辑]二至圈是在天球上的子午线，它通过天球的南北极和两个至点：巨蟹宫第一点和摩羯宫第一点。
参考资料
[编辑]- John Brian Harley, David Woodward. The History of cartography, Volume 2. Oxford University Press US, 1987. ISBN 978-0-226-31635-2. Page 28.
- Geminus, James Evans, J. L. Berggren. Geminos's Introduction to the phenomena: a translation and study of a Hellenistic survey of astronomy. Princeton University Press, 2006. ISBN 978-0-691-12339-4. Page 130.
- Ovason, David. "The Secret Architecture of the Nations Capital. Harper Collins 1999. Page 98.
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