The LMT Calculator

Local Mean TIme is the current time of the District.

For eg,

Trichur is 5 deg 45 minutes away, in longitude from the Indian Standard Point, Madras

So the time of Madras is the IST and the Time of Trichur -5.45 = 23 minutes from the Standard Point.

In the Ascendant Calculation, LMT is used, not IST.