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Re: Celestial Navigation Data from USNO--alternative
From: Bill Ritchie
Date: 2019 Nov 25, 10:46 +0000

Astron can also provide a similar Nautical Almanac listing. The attached screenshot is for the same location and time.

All results agree within 0.1'. Andres quotes Hc to 2 places and, if Astron settings changed to do this (not shown),

all Hc agree within 0.01' except for Moon.

Astron gives the Moon Hc as -04° 51.79'. Andres as -04º 51.88'.. Frank's Lunars Calculator, tweaked to extract the

extra decimal place, gives -04° 51.84' , midway between the two!

Bill Ritchie

50N 003W

On Sun, Nov 24, 2019 at 3:48 PM Dave Walden <NoReply_Walden@fer3.com> wrote:

Andres Ruiz' Navigational Algorithms program can produce a very nice version of the USNO table of Celestial Navigation Data. Go to Nautical Almanac/Identification of Stars and Planets/Hc, Zn. The below table is produced (with better spacing):
[24/11/2037 14:00:00]
39º 00.0' N 077º 00.0' W
Body GHA Dec Zn Hc
Sun 33º 18.4' -20º 40.8' 137.3 17º 39.97'
Moon 192º 5.8' 20º 47.4' 301.8 -04º 51.88'
Mercury 10º 40.4' -25º 29.3' 124.2 00º 37.33'
Venus 347º 33.2' -26º 4.6' 111.1 -15º 39.49'
Mars 220º 56.1' 20º 4.9' 323.4 -21º 57.48'
Jupiter 151º 59.0' 20º 27.5' 277.5 24º 07.12'
Saturn 106º 42.2' 7º 23.1' 228.0 48º 37.11'
Acamar 228º 56.5' -40º 9.4' 258.0 -68º 25.97'
Achernar 249º 5.2' -57º 3.0' 193.5 -71º 13.19'
Acrux 86º 41.7' -63º 18.1' 184.4 -12º 35.66'
Adhara 168º 50.3' -29º 1.4' 247.6 -19º 05.69'
Al_Na'ir 301º 13.5' -46º 46.8' 118.3 -57º 08.23'
Aldebaran204º 20.6' 16º 34.9' 307.6 -15º 47.76'
Alioth 79º 57.6' 55º 45.2' 354.3 73º 07.83'

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