Determine your exact birth date
Determine your exact birth time
Determine your birth location
Convert the birth time to the correct time zone for the location
Use an ephemeris, astrology software, or a reliable moon sign calculator
Find the Moon’s zodiac position for your birth date and time
Check whether the Moon changed signs near your birth time
If needed, calculate the Moon’s degree and compare it to zodiac sign boundaries
Record the zodiac sign the Moon was in at the exact moment of birth