**Jewish Time-Zemanim Definitions**

- Alos HaShachar = 72 Minutes before Netz
- Alos HaShachar = When the center of the sun is at a 16.113 degrees depression angle below the horizon
- Misheyakir = When the center of the sun is at an 11 degrees depression angle below the horizon
- Netz HaChamah (Sunrise) = When the center of the sun is at a 0.833 degrees depression angle below the horizon
- Sof Zman Krias Shema = Gr"a; 1/4 of the day from Netz to Shkiah
- Sof Zman Krias Shema = Magen Avraham; 1/4 of the day from Alos 72 to Tzais 72
- Sof Zman Tefillah = Gr"a; 1/3 of the day from Netz to Shkiah
- Sof Zman Tefillah = Magen Avraham; 1/3 of the day from Alos 72 to Tzais 72
- Chatzos = 1/2 of the day from Netz to Shkiah is the true high noon and Shkiah to Netz is the true midnight.
- Minchah Gedolah = Either 30 minutes or a half hour Shaah Zmaniyos after Chatzos, whikever is later
- Minchah Ketanah = 9.5/12 of the day from Netz to Shkiah
- Plag HaMinchah = 10.75/12 of the day from Netz to Shkiah
- Candle Lighting = 18 minutes before Shkiah, in Jerusalem it's 40 minutes before Shkiah.
- Shkias Hachamah (Sunset) = When the center of the sun is at a 0.833 degrees depression angle below the horizon
- Tzais HaKochavim = When the center of the sun is at a 9.25 degrees depression angle below the horizon
- Tzais HaKochavim = 72 Minutes after Shkiah