What is difference between "A1Gregorian" and just "Gregorian" to describe an epoch?
What is difference between "A1Gregorian" and just "Gregorian" to describe an epoch?
or A1ModJulian verses UTCModJulian? never heard of "A1" before
thanks
What is difference between "A1Gregorian" and just "Gregorian" to describe an epoch?
or A1ModJulian verses UTCModJulian? never heard of "A1" before
thanks