RETROGRESSION
All the planets are seen moving from West to East but for some time the planets (Excluding the Sun and the Moon) appear to move in the opposite direction i.e., East to West at this time their longitudes go on decreasing and such they are called retrograde.
Actually, all the planets and revolving around the Sun in one direction and are never retrograde i.e., never move backwards, if we view them from the sun. But on seeing from the earth their motion appears retrograde, which is due to variation in their distance from the Sun and time of completion of one revolution of the Sun.
The earth is revolving round the Sun and the Moon round the Earth, so they never become retrograde.
COMBUSTION
The planets are called combust when they are near the sun in longitudes and their rays which are the reflection of the Sun’s rays are intermingled with that of the Sun whose rays are much stronger. Therefore, the effect of the planets becomes much less. The planet under combustion is not visible, being too near the Sun, and is called Asta
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