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Starry Night Pro, nor thier "subject matter expert" community, has answered my question on how they calculate the ancient Earth's pole. So I just posted the following follow-up question on their forum ... see the thread here <[support.simulationcurriculum.com];



Hi All, Here is a further clarification of my question:

My version of Starry Night Pro (6.4.3) shows Vega culminating North at a declination of 86.2407 degrees, 12008 BC. The discrepancy is that I calculate Vega culminating North at declination 86.54 degrees, 12070 BC. I use the obliquity and precession model published by A.L. Berger (1976. Obliquity and Precession for the last 5,000,000 years. Astron. & Astrophys. 51, 127-135). I think that has become a standard calculation method used, for example, by climate change modelers, and considered relatively accurate especially for the recent past (last precession cycle or so). The difference between my value and Starry Night's value (for the declination) is not due to our very slightly different proper motions. Starry Night quotes a proper motion for Vega (0.2008, 0.2872) (RA,Dec) arcsec/year. The current SIMBAD website quoted values are (0.20094, 0.28623) [same units]. I used (0.20103, 0.28747) which was at the time the SIMBAD quoted value. That is clearly not the issue because those differences in proper motion yield less than 0.002 degrees differences over 14,000 years. (Compared to the 1.36 degrees movement of the whole proper motion itself.) The &#916;T calculation can not be the source of the different culmination declinations (about 0.3 degrees difference). That difference is due to the calculated orientation of Earth’s pole. My question is how does Starry Night Pro calculate Earth’s pole during that epoch (circa 12,000 BC)?


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Zep Tepi 305 loveritas 07-Mar-13 11:01
Re: Zep Tepi 165 Poster Boy 08-Mar-13 15:17
Re: Zep Tepi 187 loveritas 08-Mar-13 20:31
Mostly offline next couple of days 188 Thomas Brophy 08-Mar-13 23:57
Re: Mostly offline next couple of days 151 loveritas 09-Mar-13 00:34
Re:the waves of which dashed in powerless fury against its base. 183 Thunderbird 10-Mar-13 20:18
Nice To See You're Back 204 loveritas 12-Mar-13 04:22
Re: Nice To See You're Back 188 Thomas Brophy 16-Mar-13 04:52
GHMB 'Decorum' and Other Issues 167 Dr. Lew Graham 16-Mar-13 14:03
Re: GHMB 'Decorum' and Other Issues 184 Thomas Brophy 16-Mar-13 20:18
High on Ego 162 loveritas 16-Mar-13 21:59
and self righteous arrogance 202 Sirius7237 16-Mar-13 22:18
Re: GHMB 'Decorum' and Other Issues 185 Bobajot 17-Mar-13 02:15
Re: GHMB 'Decorum' and Other Issues 177 Aine 17-Mar-13 22:04
Relying Upon One's Discernment 219 Dr. Lew Graham 18-Mar-13 01:35
Re: Relying Upon One's Discernment 698 cladking 18-Mar-13 20:58
Atrophy of Discernment 198 Dr. Lew Graham 18-Mar-13 21:34
Re: Atrophy of Discernment 221 cladking 18-Mar-13 21:59
A Miracle? 208 Dr. Lew Graham 18-Mar-13 23:42
Accidently hit "quote" instead of post and failed to correct 201 cladking 19-Mar-13 00:20
Miracles? 178 Dr. Lew Graham 19-Mar-13 00:30
Re: A Miracle? 117 Poster Boy 19-Mar-13 00:47
Typo 203 Dr. Lew Graham 19-Mar-13 01:00
Sarcasm? 178 Sirius7237 19-Mar-13 03:04
More Hypocrisy 186 loveritas 19-Mar-13 05:32
Re: Typo 162 Poster Boy 19-Mar-13 03:26
yes, maybe thinking is not ultimate ground of being 164 Thomas Brophy 18-Mar-13 23:03
Re: yes, maybe thinking is not ultimate ground of being 197 cladking 19-Mar-13 02:16
I addressed your question on Zep Tepi, no? 165 Thomas Brophy 18-Mar-13 04:41
Re: I addressed your question on Zep Tepi, no? 191 loveritas 18-Mar-13 06:07
Re: I addressed your question on Zep Tepi, no? 234 Thomas Brophy 18-Mar-13 22:30
Re: I addressed your question on Zep Tepi, no? 204 loveritas 18-Mar-13 22:38
I'll Rephrase the Question 202 loveritas 19-Mar-13 20:42
Re: I'll Rephrase the Question 199 Aine 19-Mar-13 21:37
Re: I'll Rephrase the Question 193 loveritas 20-Mar-13 11:54
Re: I'll Rephrase the Question 198 Thomas Brophy 20-Mar-13 17:47
Re: I'll Rephrase the Question 195 Thunderbird 20-Mar-13 18:29
Re: I'll Rephrase the Question 179 loveritas 20-Mar-13 21:33
Re: I'll Rephrase the Question 182 Spiros 20-Mar-13 22:13
Re: I'll Rephrase the Question 206 Laird Scranton 21-Mar-13 16:50
Re: I'll Rephrase the Question 222 Spiros 21-Mar-13 19:16
Re: I'll Rephrase the Question 198 Audrey 24-Mar-13 04:25
Re: I'll Rephrase the Question 178 Thomas Brophy 24-Mar-13 06:10
Re: I'll Rephrase the Question 153 loveritas 24-Mar-13 06:54
Starry Night Pro calculation still not clarified 220 Thomas Brophy 29-Mar-13 22:02
Re: Starry Night Pro calculation still not clarified 197 loveritas 30-Mar-13 02:05
Re: What if?...... 165 Thunderbird 30-Mar-13 20:56
Re: What if?...... 182 loveritas 30-Mar-13 23:55
Re: Zawiyet el-Aryan meridian observation shaft/Water clock 324 Thunderbird 31-Mar-13 03:37
Re: Zawiyet el-Aryan meridian observation shaft/Water clock 196 loveritas 31-Mar-13 07:56
Bond of Heaven and Earth 329 loveritas 01-Apr-13 01:25
Djed-raising ropes? 196 Thomas Brophy 01-Apr-13 01:40
Re: Djed-raising ropes? 202 loveritas 01-Apr-13 05:18
Re: Djed-raising ropes? 194 Thomas Brophy 01-Apr-13 06:47
Re: Djed-raising ropes? 200 loveritas 01-Apr-13 06:58
Re: Djed-raising ropes? 196 Thomas Brophy 01-Apr-13 07:05
Re: Djed-raising ropes? 180 loveritas 01-Apr-13 07:11
Re: Djed-raising ropes? 199 Thomas Brophy 01-Apr-13 07:24
Re: Ability....and transitions of time. 192 Thunderbird 01-Apr-13 23:19
Re: Ability....and transitions of time. 171 loveritas 01-Apr-13 23:53
Re: King and Queen Ascending/Descending 238 Thunderbird 02-Apr-13 20:07
Re: King and Queen Ascending/Descending 174 loveritas 02-Apr-13 22:37
Re: Bond of Heaven and Earth 214 Thunderbird 01-Apr-13 03:55
Some basics... 201 Thomas Brophy 31-Mar-13 00:16
Re: Starry Night Pro calculation still not clarified 190 Spiros 30-Mar-13 06:30
Help ask Starry Night 192 Thomas Brophy 31-Mar-13 00:58
Re: Help ask Starry Night 226 Spiros 31-Mar-13 17:58
Starry Night Pro 'fesses up to precession calculation errors 602 Thomas Brophy 02-Apr-13 19:29
Re: Starry Night Pro 'fesses up to precession calculation errors 244 Spiros 02-Apr-13 20:59
Re: Starry Night Pro 'fesses up to precession calculation errors 183 Thomas Brophy 02-Apr-13 21:22
Starry Night Pro precession calculation fix delayed 235 Thomas Brophy 10-May-13 22:39
Re: Starry Night Pro precession calculation fix delayed 206 loveritas 11-May-13 01:22
Re: Starry Night Pro precession calculation fix delayed 197 Spiros 13-May-13 22:10
What is your culminating declination? 189 Thomas Brophy 13-May-13 22:49
Re: What is your culminating declination? 190 Spiros 13-May-13 23:27
Re: What is your culminating declination? 196 Thomas Brophy 14-May-13 00:13
Re: What is your culminating declination? 159 Spiros 19-May-13 01:31
Re: I'll Rephrase the Question 247 Thomas Brophy 21-Mar-13 04:20
Einstein Not Necessary 180 loveritas 21-Mar-13 06:37
Memory & Einstein 179 loveritas 24-Mar-13 23:10
Re: Memory & Einstein 197 Thomas Brophy 24-Mar-13 23:43
Re: Zep Tepi 180 Eddie Larry 14-May-13 03:45
Re: Zep Tepi 184 Sirfiroth 15-May-13 02:15
Re: Zep Tepi 167 Eddie Larry 15-May-13 03:02


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