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» Online Classroom   »   » Public Discussion of Cel Nav   » Moonrise time in the nautical almanac

   
Author Topic: Moonrise time in the nautical almanac
Paul


 - posted July 03, 2007 05:12 PM      Profile for Paul           Edit/Delete Post 
Tomorrow's (7-4-2007) page in the nautical almanac has a double entry for moonrise at N 72. What's that all about?
From: Muncie
David Burch


 - posted July 03, 2007 09:18 PM      Profile for David Burch           Edit/Delete Post 
Go to the USNA AA page and to sun moon data for one day, ie http://aa.usno.navy.mil/data/docs/RS_OneDay.html

and enter your data. yo uwill get for 72 N

The following information is provided for (longitude E0.0, latitude N72.0):

Wednesday
4 July 2007 Universal Time

SUN
Sun transit 12:04

MOON
Moonrise 00:38
Moon transit 03:06
Moonset 06:01
Moonrise 23:43
Moonset 08:38 on following day


Note: Missing Sun phenomena indicate Sun above horizon for extended period of time.

Phase of the Moon on 4 July: waning gibbous with 83% of the Moon's visible disk illuminated.

Last quarter Moon on 7 July 2007 at 16:54 Universal Time.
which means the moon rises and sets twice on that day at that lat. if you use the star finder or the actual usno aa data for Hc and Zn you can follow it across the sky as just barely rises over the horizon:

code:
Celestial Navigation Data for 2007 Jul  4 at  0:38:00 UT           

For Assumed Position: Latitude N 72 00.0
Longitude 0 00.0

Almanac Data | Altitude Corrections
Object GHA Dec Hc Zn | Refr SD PA Sum
o ' o ' o ' o | ' ' ' '
SUN 188 26.1 N22 55.5 + 5 06.1 7.8 | -9.9 15.7 0.1 6.0
MOON 324 13.4 S14 38.8 + 0 07.2 145.6 | --- --- --- ---
=========
Celestial Navigation Data for 2007 Jul 4 at 1:38:00 UT

For Assumed Position: Latitude N 72 00.0
Longitude 0 00.0

Almanac Data | Altitude Corrections
Object GHA Dec Hc Zn | Refr SD PA Sum
o ' o ' o ' o | ' ' ' '
SUN 203 25.9 N22 55.3 + 6 16.4 21.6 | -8.3 15.7 0.1 7.5
MOON 338 43.8 S14 24.7 + 2 25.2 159.4 | -20.7 15.8 58.0 53.2
============

Celestial Navigation Data for 2007 Jul 4 at 2:38:00 UT

For Assumed Position: Latitude N 72 00.0
Longitude 0 00.0

Almanac Data | Altitude Corrections
Object GHA Dec Hc Zn | Refr SD PA Sum
o ' o ' o ' o | ' ' ' '
SUN 218 25.8 N22 55.1 + 8 28.6 35.4 | -6.4 15.7 0.1 9.5
MOON 353 14.3 S14 10.4 + 3 42.4 173.4 | -15.2 15.8 58.0 58.6
===========
Celestial Navigation Data for 2007 Jul 4 at 4:38:00 UT

For Assumed Position: Latitude N 72 00.0
Longitude 0 00.0

Almanac Data | Altitude Corrections
Object GHA Dec Hc Zn | Refr SD PA Sum
o ' o ' o ' o | ' ' ' '
SUN 248 25.6 N22 54.7 +15 24.1 62.7 | -3.6 15.7 0.1 12.3
MOON 22 15.4 S13 41.8 + 3 01.2 201.6 | -17.8 15.8 58.1 56.1
======
Celestial Navigation Data for 2007 Jul 4 at 5:38:00 UT

For Assumed Position: Latitude N 72 00.0
Longitude 0 00.0

Almanac Data | Altitude Corrections
Object GHA Dec Hc Zn | Refr SD PA Sum
o ' o ' o ' o | ' ' ' '
SUN 263 25.5 N22 54.5 +19 43.9 76.4 | -2.8 15.7 0.1 13.1
MOON 36 46.0 S13 27.3 + 1 06.9 215.6 | -30.0 15.8 58.1 44.0


From: Starpath, Seattle, WA
Paul


 - posted July 04, 2007 12:47 PM      Profile for Paul           Edit/Delete Post 
I finally figured it out on my own that the data must mean two moonrises on the same day. It hadn't occurred to me before that it was possible.

But thanks for your detailed help, and thanks for the link to the USNO data. That's a fun site.

From: Muncie


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