#1 havdalah calculated from Friday

[Danny Sadinoff]

[submitted by xxxx@yyyy ]

I'm very impressed with your hebcal website, and I'd
like to point out that the havdalah time computed by
your software should take into account the sunset time
of Saturday, and not of Friday. Since the sunset time
varies from Friday to Saturday, the Havdalah time is
not always 72 mins after sundown on Friday, for
instance.

If you could fix your software to incorporate this
change, perhaps the Havdalah time would be more
accurate.

[Danny Sadinoff]

Logged In: YES
user_id=269

Thank you for submitting a bug report for hebcal.

Your request has been queued for assessment and, with luck, will
be fixed Real Soon Now.

-the hebcal maintainters

[Michael J. Radwin]

Logged In: YES
user_id=304306

I'm not sure this is a real bug. Using hebcal 3.2, it
appears that sunset is re-calculated using saturday's date.

you can do a simple test to verify this by looking at
havdalah times -18 minutes after sundown (the same offset
as friday's candle lighting) and notice that sometimes
havdalah is a minute earlier or later.

hebcal -c -m -18 -x -h 1 2002

1/4/2002 Candle lighting: 4:24
1/5/2002 Havdalah (-18 min): 4:24
1/11/2002 Candle lighting: 4:30
1/12/2002 Havdalah (-18 min): 4:31
1/18/2002 Candle lighting: 4:38
1/19/2002 Havdalah (-18 min): 4:39
1/25/2002 Candle lighting: 4:46
1/26/2002 Havdalah (-18 min): 4:48

hebcal -c -m -18 -x -h 8 2002
8/2/2002 Candle lighting: 7:53
8/3/2002 Havdalah (-18 min): 7:52
8/9/2002 Candle lighting: 7:45
8/10/2002 Havdalah (-18 min): 7:44
8/16/2002 Candle lighting: 7:36
8/17/2002 Havdalah (-18 min): 7:34
8/23/2002 Candle lighting: 7:26
8/24/2002 Havdalah (-18 min): 7:24
8/30/2002 Candle lighting: 7:15
8/31/2002 Havdalah (-18 min): 7:13

-michael

[Michael J. Radwin]

Hebcal has moved to GitHub. Please see https://github.com/hebcal/hebcal/issues