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The immensity of the heaven compared with the size of
Derivation of the triple motion of the Earth
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Al-Battani anomaly in parallax apogee apparent motion apsides ascension centre Chapter Christ Copernicus correction diameter difference Earth Earth's orbit east eastern eccentric circle ecliptic Egyptian month epicycle equal equator equatorial circle Euclid's Elements fixed stars Hadrian half the chord Hence Hipparchus horizon irregular Jupiter known latitude line of intersection longitude lower apsis Mars mean motion mean position Mercury meridian meridian circle Mesori middle midpoint Moon Moon's motion in parallax move northern obliquity observations opposite perigee planet pole precession Ptolemy quadrant radius ratio regular motion remaining angle remaining side revolution right angles right ascension round Saturn semicircle shadow similarly sixtieths solstice southern sphere spring equinox straight line subtended by twice subtracted Sun and Moon theorem third triangle tude tude tude UNALLOCATED STARS units upper apsis variation Venus western whole