A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: DIY Tables?
From: Greg Rudzinski
Date: 2015 Aug 29, 09:37 -0700
Here is the up dated correction to Table 4 a corr.
Good catch for February 2020. Add 20 hours following leap day. All I did was to extrapolate forward then do a check against USNO to confirm correction. This table doesn't need to be perfect. rounding to the nearest hour is good enough. You will see that there is 25 hours difference between 1988/1992, 2000/2004,2008/2012. I'm not sure what the rule is for this so I just work up a sight for the future date in question to make sure results are close.
From: Herman Dekker
Date: 2015 Aug 28, 06:29 -0700
I see the extended Table 4 Year correction, the correcxtion is to year 2028.
I understand is that in a year when februar has 29 days after the 29 you have to use the * correction.
In your handwritten correction after the 29 it is 25 hours more. In the original table from 1981 until 2016 it is
always 24 hours more. Can you explain??
NB. the correction for 2020 after 29 februar is missing, I suppose it must be +20* (or +19*???)
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