Halachic times for prayer and mitzvot
72 minutes before sunrise
When you can distinguish between blue and white
First light of day
GR"A - 3 halachic hours after sunrise
GR"A - 4 halachic hours after sunrise
Halachic noon - midpoint between sunrise and sunset
Half seasonal hour after midday
2.5 seasonal hours before sunset
1.25 seasonal hours before sunset
Sun disappears below horizon
When 3 medium stars are visible
Halachic midnight
1/12 of the day
Zmanim (Hebrew for "times") are halachic times that define when certain mitzvot should be performed throughout the day.
These times are calculated based on astronomical phenomena such as sunrise, sunset, and twilight, and vary by location and date.
Note: Different customs may use different calculation methods. Consult your rabbi for specific guidance.