As I recall, it was that passage you quoted which led one rabbi to respond that no services need to be performed or prayers said by the first Jew in orbit around Earth (who may have been Judith Resnick, but I can't verify that at the moment).

I'm Reform (like you couldn't tell...), and if I were a rabbi I would say this: one takes one's time conventions along. When it's Friday on Earth, Jews on the Moon will most likely go by whatever time is already being used to determine when to start Shabbat. When an extrasolar planet has at least ten Jews above the age of 13 living on it, they will probably observe Shabbat when the sun sets every seventh day, regardless of the length of the day in standard seconds.

What's important about the mitzvot to a Reform Jew is not the letter but the spirit. Neither "What's more proper?" or "Who's more devout?" are as appropriate questions to ask as is "What makes sense?"

Nu, Sunblok - bist auch ein Yid?

Fox