Can Mars retrograde where the Sun is present? (Part 23 of the MB series)

In the 23rd part of the Mahabharata series, the 2nd planetary nimitta told by Karna to Krishna is discussed. Karna said that Mars made a vakri movement from Jyeshtha to Anuradha. This is an anomalous observation because, the month being Kartika, the Sun was also there in Scorpio, and Mars placed in Jyeshtha in Scorpio cannot make a vakri movement. 

After explaining astronomically why it cannot do so, I am pointing out the versions of four Mahabharata researchers (3067 BCE, 3162 BCE, and 5561 BCE) on the funny explanations given by them. But the fact remains Mars made a rightward swing at the time the comet 'stood' on Pushya, which will be explained later in the series.