Interesting. But maybe all Jewish traditions do not follow that most reasonable formula?It's a both simple and complex answer. Shabbat starts at sundown Friday until it is dark enough to see 3 starts Saturday. Candle lighting times on Jewish calendars are 18 minutes before sundown to 1 hour after. Absent those, Shabbat is the period of time between lighting candles on Friday night and Havdalah on Saturday night.
Chabad.org for instance says this on their website:
"Caution: Shabbat candles must be lit before sunset. It's a desecration of the Shabbat to light candles after sunset.
Shabbat candle lighting times listed are 18 minutes before sunset, however please allow yourself enough time to perform this time-bound mitzvah at the designated time; do not wait until the last minute."
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www.chabad.org
As a Christian and never a Jew, I would never assume any authority or privilege to instruct a Jewish person on what they should or must believe in matters of God's law. But most of my Jewish friends/acquaintances seem to hold to the concept that keeping the spirit of God's law is what He requires.
That happens to be pretty much the rule of thumb I go by as well.
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