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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: GHA Aries long term Table?
From: Peter Hakel
Date: 2014 Dec 19, 04:44 +0000
From: Peter Hakel <NoReply_PeterHakel@fer3.com>
To: pmh099@yahoo.com
Sent: Thursday, December 18, 2014 8:21 PM
Subject: [NavList] Re: GHA Aries long term Table?
From: Samuel L <NoReply_SamuelL@fer3.com>
To: pmh099---.com
Sent: Wednesday, December 17, 2014 6:16 AM
Subject: [NavList] GHA Aries long term Table?
From: Peter Hakel
Date: 2014 Dec 19, 04:44 +0000
I am not sure if the attachment went through - trying again.
I should also add that this file contains a correction of an error I had made in the past in entering the nutation term (see page 88 in Meeus's book). The resulting change is minuscule with no practical effect for celestial navigation purposes - but, if you look closely, it's there. All almanac spreadsheets have been corrected accordingly and these new versions are available at the website for download.
Peter Hakel
From: Peter Hakel <NoReply_PeterHakel@fer3.com>
To: pmh099@yahoo.com
Sent: Thursday, December 18, 2014 8:21 PM
Subject: [NavList] Re: GHA Aries long term Table?
Samuel,
Formulae from Chapter 12 of Jean Meeus’s book “Astronomical Algorithms (Second Edition)” are encoded in the attached Excel spreadsheet.
Peter Hakel
http://www.navigation-spreadsheets.com/
Formulae from Chapter 12 of Jean Meeus’s book “Astronomical Algorithms (Second Edition)” are encoded in the attached Excel spreadsheet.
Peter Hakel
http://www.navigation-spreadsheets.com/
From: Samuel L <NoReply_SamuelL@fer3.com>
To: pmh099---.com
Sent: Wednesday, December 17, 2014 6:16 AM
Subject: [NavList] GHA Aries long term Table?
2015 is coming....surely.
HO 249 Volume 1 page 340 has "Table 4- GHA Y for the years 2006 to 2014" which is a very compact way to determining GHA Y (Aries) for stars.
See here (page 339)-
http://www.waypointamsterdam.com/Han...Pub249Vol1.pdf
HO 249 Volume 1 page 340 has "Table 4- GHA Y for the years 2006 to 2014" which is a very compact way to determining GHA Y (Aries) for stars.
See here (page 339)-
http://www.waypointamsterdam.com/Han...Pub249Vol1.pdf
I use it instead of carrying around the NA. (I can easily calculate Hc and Az using the Spherical Trig formulas so I can reduce the amount of paper on board).
But, that sheet will expire this year. Do you know of the same Table 4 for the coming years?
Or rather...do you know of quick, accurate way to determine GHA Aries?
Thanks,
But, that sheet will expire this year. Do you know of the same Table 4 for the coming years?
Or rather...do you know of quick, accurate way to determine GHA Aries?
Thanks,
Sam L.
File: 129690.aries_stars.xls
