P2 is a liquid fuelled vehicle. So filling up.etc was done at night per the report.sum wrote:Whats the special requirement for a night trial?
Also has the SFC ever testfired from anywhere except ITR? Is it assumed that in actual combat, it would be fired from ITR since there has never been any testing from any non DRDO location?
So that's the uniqueness.
Also optical tracking the trajectory will be better.
For very long range launches, the practice is to make use of time zone to have darkness in splash zone for optical tracking.
An old book circa 1958 explained the theory.