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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 362 loveritas 07-Mar-13 11:01
Re: Zep Tepi 210 Poster Boy 08-Mar-13 15:17
Re: Zep Tepi 221 loveritas 08-Mar-13 20:31
Mostly offline next couple of days 234 Thomas Brophy 08-Mar-13 23:57
Re: Mostly offline next couple of days 187 loveritas 09-Mar-13 00:34
Re:the waves of which dashed in powerless fury against its base. 224 Thunderbird 10-Mar-13 20:18
Nice To See You're Back 248 loveritas 12-Mar-13 04:22
Re: Nice To See You're Back 234 Thomas Brophy 16-Mar-13 04:52
GHMB 'Decorum' and Other Issues 208 Dr. Lew Graham 16-Mar-13 14:03
Re: GHMB 'Decorum' and Other Issues 227 Thomas Brophy 16-Mar-13 20:18
High on Ego 197 loveritas 16-Mar-13 21:59
and self righteous arrogance 234 Sirius7237 16-Mar-13 22:18
Re: GHMB 'Decorum' and Other Issues 245 Bobajot 17-Mar-13 02:15
Re: GHMB 'Decorum' and Other Issues 220 Aine 17-Mar-13 22:04
Relying Upon One's Discernment 269 Dr. Lew Graham 18-Mar-13 01:35
Re: Relying Upon One's Discernment 736 cladking 18-Mar-13 20:58
Atrophy of Discernment 246 Dr. Lew Graham 18-Mar-13 21:34
Re: Atrophy of Discernment 261 cladking 18-Mar-13 21:59
A Miracle? 243 Dr. Lew Graham 18-Mar-13 23:42
Accidently hit "quote" instead of post and failed to correct 245 cladking 19-Mar-13 00:20
Miracles? 212 Dr. Lew Graham 19-Mar-13 00:30
Re: A Miracle? 151 Poster Boy 19-Mar-13 00:47
Typo 242 Dr. Lew Graham 19-Mar-13 01:00
Sarcasm? 220 Sirius7237 19-Mar-13 03:04
More Hypocrisy 229 loveritas 19-Mar-13 05:32
Re: Typo 204 Poster Boy 19-Mar-13 03:26
yes, maybe thinking is not ultimate ground of being 200 Thomas Brophy 18-Mar-13 23:03
Re: yes, maybe thinking is not ultimate ground of being 232 cladking 19-Mar-13 02:16
I addressed your question on Zep Tepi, no? 206 Thomas Brophy 18-Mar-13 04:41
Re: I addressed your question on Zep Tepi, no? 230 loveritas 18-Mar-13 06:07
Re: I addressed your question on Zep Tepi, no? 287 Thomas Brophy 18-Mar-13 22:30
Re: I addressed your question on Zep Tepi, no? 265 loveritas 18-Mar-13 22:38
I'll Rephrase the Question 240 loveritas 19-Mar-13 20:42
Re: I'll Rephrase the Question 233 Aine 19-Mar-13 21:37
Re: I'll Rephrase the Question 228 loveritas 20-Mar-13 11:54
Re: I'll Rephrase the Question 240 Thomas Brophy 20-Mar-13 17:47
Re: I'll Rephrase the Question 244 Thunderbird 20-Mar-13 18:29
Re: I'll Rephrase the Question 224 loveritas 20-Mar-13 21:33
Re: I'll Rephrase the Question 224 Spiros 20-Mar-13 22:13
Re: I'll Rephrase the Question 246 Laird Scranton 21-Mar-13 16:50
Re: I'll Rephrase the Question 267 Spiros 21-Mar-13 19:16
Re: I'll Rephrase the Question 258 Audrey 24-Mar-13 04:25
Re: I'll Rephrase the Question 219 Thomas Brophy 24-Mar-13 06:10
Re: I'll Rephrase the Question 191 loveritas 24-Mar-13 06:54
Starry Night Pro calculation still not clarified 265 Thomas Brophy 29-Mar-13 22:02
Re: Starry Night Pro calculation still not clarified 245 loveritas 30-Mar-13 02:05
Re: What if?...... 206 Thunderbird 30-Mar-13 20:56
Re: What if?...... 216 loveritas 30-Mar-13 23:55
Re: Zawiyet el-Aryan meridian observation shaft/Water clock 413 Thunderbird 31-Mar-13 03:37
Re: Zawiyet el-Aryan meridian observation shaft/Water clock 233 loveritas 31-Mar-13 07:56
Bond of Heaven and Earth 378 loveritas 01-Apr-13 01:25
Djed-raising ropes? 239 Thomas Brophy 01-Apr-13 01:40
Re: Djed-raising ropes? 241 loveritas 01-Apr-13 05:18
Re: Djed-raising ropes? 233 Thomas Brophy 01-Apr-13 06:47
Re: Djed-raising ropes? 255 loveritas 01-Apr-13 06:58
Re: Djed-raising ropes? 231 Thomas Brophy 01-Apr-13 07:05
Re: Djed-raising ropes? 217 loveritas 01-Apr-13 07:11
Re: Djed-raising ropes? 246 Thomas Brophy 01-Apr-13 07:24
Re: Ability....and transitions of time. 228 Thunderbird 01-Apr-13 23:19
Re: Ability....and transitions of time. 211 loveritas 01-Apr-13 23:53
Re: King and Queen Ascending/Descending 279 Thunderbird 02-Apr-13 20:07
Re: King and Queen Ascending/Descending 207 loveritas 02-Apr-13 22:37
Re: Bond of Heaven and Earth 254 Thunderbird 01-Apr-13 03:55
Some basics... 244 Thomas Brophy 31-Mar-13 00:16
Re: Starry Night Pro calculation still not clarified 246 Spiros 30-Mar-13 06:30
Help ask Starry Night 230 Thomas Brophy 31-Mar-13 00:58
Re: Help ask Starry Night 281 Spiros 31-Mar-13 17:58
Starry Night Pro 'fesses up to precession calculation errors 682 Thomas Brophy 02-Apr-13 19:29
Re: Starry Night Pro 'fesses up to precession calculation errors 290 Spiros 02-Apr-13 20:59
Re: Starry Night Pro 'fesses up to precession calculation errors 221 Thomas Brophy 02-Apr-13 21:22
Starry Night Pro precession calculation fix delayed 284 Thomas Brophy 10-May-13 22:39
Re: Starry Night Pro precession calculation fix delayed 244 loveritas 11-May-13 01:22
Re: Starry Night Pro precession calculation fix delayed 236 Spiros 13-May-13 22:10
What is your culminating declination? 228 Thomas Brophy 13-May-13 22:49
Re: What is your culminating declination? 222 Spiros 13-May-13 23:27
Re: What is your culminating declination? 243 Thomas Brophy 14-May-13 00:13
Re: What is your culminating declination? 190 Spiros 19-May-13 01:31
Re: I'll Rephrase the Question 310 Thomas Brophy 21-Mar-13 04:20
Einstein Not Necessary 214 loveritas 21-Mar-13 06:37
Memory & Einstein 219 loveritas 24-Mar-13 23:10
Re: Memory & Einstein 241 Thomas Brophy 24-Mar-13 23:43
Re: Zep Tepi 217 Eddie Larry 14-May-13 03:45
Re: Zep Tepi 221 Sirfiroth 15-May-13 02:15
Re: Zep Tepi 200 Eddie Larry 15-May-13 03:02


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