The rivalry between these two teams is almost 100 years old, and features in the FIFA's classic derby list.
This duration of forty Ghatis is known as Punya Kaal.
Sankranti activities, like taking bath, offering Naivedhya (food offered to deity) to Lord Surya, offering charity or Dakshina, performing Shraddha rituals and breaking fast or Parana, should be done during Punya Kaal.
Drik suggests Sankranti Muhurta which falls between Makar Sankranti moment and 40 Ghatis from it. Our holy scriptures suggest that 5 Ghatis duration after Sunrise (if Sankranti happens after Sunset on previous day) and 1 Ghati duration after Sankranti moment (if Sankranti happens in day time) are highly auspicious.
If this Muhurta is available we list it as Mahapunya Kaal Muhurta.
Being Akshaya day it is believed that Gold, bought on this day, will never diminish and would continue to grow or appreciate.