chante - clair
Mercury and its orbit - Ottoman illuminated and illustrated version of ʿAjāʾib al-makhlūqāt (Wonders of creation) by Zakarīyā al-Qazwīnī The Mercury cycle according to Rudhyar : In the usual kind of geocentric astrology no distinction is made between the two kinds of conjunction of Mercury and the Sun, except that at "inferior" conjunction Mercury is retrograde, while at "superior" conjunction Mercury is direct. In heliocentric astrology the situation is quite different, because an inferior geocentric conjunction of Mercury and the Sun means that the Earth is conjunct Mercury, while a superior geocentric conjunction indicates that the Earth is in opposition to Mercury. Thus when Mercury is retrograde geocentrically, Mercury is heliocentrically near the Earth; and at the heliocentric conjunction of Mercury and the earth, a line is formed by Sun, Mercury and Earth, with Mercury and Earth, with Mercury between the Sun and the Earth thus as