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5 added 42 characters in body
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1. Question / Issue :

Since a New Moon cannot be seenIf a New Moon cannot be seen, then it seems that the first visible confirmation of a New Moon is actually the Waxing Crescent Moon, which can only be observed from after the New Moon - minimally - after 12.1 tohours with a telescope, and 15.5 hours after the New Moon,without. (See Astronomy.SE/How Soon Could a Waxing Crescent Moon Be Seen?).

According to Judaism 101, the Jewish Calendar:

Used to be calculated by observation

Calculated mathematically since 4th century

In view of this, is there any Rabbinical commentary that helps explain how the 1st of the Month / New Moon was determined during the Temple Period?

  1. Was this pre-calculated - to "safeguard" Rosh Chodesh?
  2. Or, was it determined "After-the-fact" and the calendar day was set to the first, retroactively?

I am hoping for references that can be cited, thank you.

1. Question / Issue :

Since a New Moon cannot be seen, then it seems that the first visible confirmation of a New Moon is actually the Waxing Crescent Moon, which can only be observed from after 12.1 to 15.5 hours after the New Moon, (See Astronomy.SE/How Soon Could a Waxing Crescent Moon Be Seen?).

According to Judaism 101, the Jewish Calendar:

Used to be calculated by observation

Calculated mathematically since 4th century

In view of this, is there any Rabbinical commentary that helps explain how the 1st of the Month / New Moon was determined during the Temple Period?

  1. Was this pre-calculated - to "safeguard" Rosh Chodesh?
  2. Or, was it determined "After-the-fact" and the calendar day was set to the first, retroactively?

I am hoping for references that can be cited, thank you.

1. Question / Issue :

If a New Moon cannot be seen, then it seems that the first visible confirmation of a New Moon is actually the Waxing Crescent Moon, which can only be observed after the New Moon - minimally - after 12.1 hours with a telescope, and 15.5 hours without. (See Astronomy.SE/How Soon Could a Waxing Crescent Moon Be Seen?).

According to Judaism 101, the Jewish Calendar:

Used to be calculated by observation

Calculated mathematically since 4th century

In view of this, is there any Rabbinical commentary that helps explain how the 1st of the Month / New Moon was determined during the Temple Period?

  1. Was this pre-calculated - to "safeguard" Rosh Chodesh?
  2. Or, was it determined "After-the-fact" and the calendar day was set to the first, retroactively?

I am hoping for references that can be cited, thank you.

4 Clarified question, added citation from Astronomy.SE regarding the Waxing Crescent Moon.
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How was Rosh Chodesh determined, during the Temple Periodif a New Moon Cannot be Seen?

1. Question / Issue :

According to Judaism 101 Since a New Moon cannot be seen, then it seems that the Jewish Calendar:first visible confirmation of a New Moon is actually the Waxing Crescent Moon, which can only be observed from after 12.1 to 15.5 hours after the New Moon, (See Astronomy.SE/How Soon Could a Waxing Crescent Moon Be Seen?).

According to Judaism 101, the Jewish Calendar:

Used to be calculated by observation

Calculated mathematically since 4th century

IsIn view of this, is there any documentationRabbinical commentary that helps explain how Rosh Chodeshthe 1st of the Month / New Moon was determined during the Temple Period?

  1. Was this pre-calculated - to "safeguard" Rosh Chodesh?
  2. Or, was it determined "After-the-fact" and the calendar day was set to the first, retroactively?

I am hoping for references that can be cited, thank you.

How was Rosh Chodesh determined, during the Temple Period?

According to Judaism 101, the Jewish Calendar:

Used to be calculated by observation

Calculated mathematically since 4th century

Is there any documentation how Rosh Chodesh was determined during the Temple Period?

  1. Was this pre-calculated - to "safeguard" Rosh Chodesh?
  2. Or, was it determined "After-the-fact" and the calendar day was set to the first, retroactively?

I am hoping for references that can be cited, thank you.

How was Rosh Chodesh determined, if a New Moon Cannot be Seen?

1. Question / Issue :

Since a New Moon cannot be seen, then it seems that the first visible confirmation of a New Moon is actually the Waxing Crescent Moon, which can only be observed from after 12.1 to 15.5 hours after the New Moon, (See Astronomy.SE/How Soon Could a Waxing Crescent Moon Be Seen?).

According to Judaism 101, the Jewish Calendar:

Used to be calculated by observation

Calculated mathematically since 4th century

In view of this, is there any Rabbinical commentary that helps explain how the 1st of the Month / New Moon was determined during the Temple Period?

  1. Was this pre-calculated - to "safeguard" Rosh Chodesh?
  2. Or, was it determined "After-the-fact" and the calendar day was set to the first, retroactively?

I am hoping for references that can be cited, thank you.

    Post Reopened by MTL, kouty, Danny Schoemann, DonielF, msh210
3 no need for a numbered title when there's only one section, IMO
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1. Question - a Request for Citable Reference

According to Judaism 101, the Jewish Calendar , the Jewish Calendar:

Used to be calculated by observation

Calculated mathematically since 4th century

Is there any documentation how Rosh Chodesh was determined during the Temple Period?

  1. Was this pre-calculated - to "safeguard" Rosh Chodesh?
  2. Or, was it determined "After-the-fact" and the calendar day was set to the first, retroactively?

I am hoping for references that can be cited, thank you.

1. Question - a Request for Citable Reference

According to Judaism 101, the Jewish Calendar :

Used to be calculated by observation

Calculated mathematically since 4th century

Is there any documentation how Rosh Chodesh was determined during the Temple Period?

  1. Was this pre-calculated - to "safeguard" Rosh Chodesh?
  2. Or, was it determined "After-the-fact" and the calendar day was set to the first, retroactively?

I am hoping for references that can be cited, thank you.

According to Judaism 101, the Jewish Calendar:

Used to be calculated by observation

Calculated mathematically since 4th century

Is there any documentation how Rosh Chodesh was determined during the Temple Period?

  1. Was this pre-calculated - to "safeguard" Rosh Chodesh?
  2. Or, was it determined "After-the-fact" and the calendar day was set to the first, retroactively?

I am hoping for references that can be cited, thank you.

2 Added missing quote, and fixed the title. Stack states it wasn't edited - but it was not the question I wrote. ??
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    Post Closed as "Needs details or clarity" by Double AA
1
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