Combust Retrograde Planets:
In Vedic Astrology all astronomical observations are done considering the earth to be the reference point. This system of observation is called 'geocentric'. In any system of measurements, the reference point is considered stationary, though it may actually be moving.
When a planet is retrograde it is closer to the Earth than at any other time during its orbit. Mercury and Venus (planets inside the Earth's orbit) are closest when their celestial longitude is exactly the same as the Sun. The planets outside the Earth's orbit (Mars, Jupiter, Saturn) are closest when exactly opposite the Sun...see below diagram.
Image Source: http://www.utm.edu/staff/nlillega/phil120.htm
From this we can easily understand that the outer planets (Mars, Jupiter, Saturn) cannot be combust whilst in retrograde motion.
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