By YK Agrawal
As We know that Jupiter in a sign for 13 months. Again during this period Jupiter is retrograde for some time. So you can know either Jupiter is retrograde or not in a horoscope.
For this you have to check Sun position with respect of Jupiter.
When Sun goes to 5th from Jupiter then Jupiter may be retrograde. And when Sun goes to 9th from Jupiter it’s become Margi again.