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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 Earthâ€™s pole. My question is how does Starry Night Pro calculate Earthâ€™s pole during that epoch (circa 12,000 BC)?

Subject Views Written By Posted
Zep Tepi 496 loveritas 07-Mar-13 11:01
Re: Zep Tepi 317 PB Bytes 08-Mar-13 15:17
Re: Zep Tepi 309 loveritas 08-Mar-13 20:31
Mostly offline next couple of days 350 Thomas Brophy 08-Mar-13 23:57
Re: Mostly offline next couple of days 287 loveritas 09-Mar-13 00:34
Re:the waves of which dashed in powerless fury against its base. 319 Thunderbird 10-Mar-13 20:18
Nice To See You're Back 351 loveritas 12-Mar-13 04:22
Re: Nice To See You're Back 332 Thomas Brophy 16-Mar-13 04:52
GHMB 'Decorum' and Other Issues 327 Dr. Lew Graham 16-Mar-13 14:03
Re: GHMB 'Decorum' and Other Issues 322 Thomas Brophy 16-Mar-13 20:18
High on Ego 292 loveritas 16-Mar-13 21:59
and self righteous arrogance 325 Sirius7237 16-Mar-13 22:18
Re: GHMB 'Decorum' and Other Issues 355 Bobajot 17-Mar-13 02:15
Re: GHMB 'Decorum' and Other Issues 325 Aine 17-Mar-13 22:04
Relying Upon One's Discernment 368 Dr. Lew Graham 18-Mar-13 01:35
Re: Relying Upon One's Discernment 856 cladking 18-Mar-13 20:58
Atrophy of Discernment 357 Dr. Lew Graham 18-Mar-13 21:34
Re: Atrophy of Discernment 360 cladking 18-Mar-13 21:59
A Miracle? 339 Dr. Lew Graham 18-Mar-13 23:42
Accidently hit "quote" instead of post and failed to correct 346 cladking 19-Mar-13 00:20
Miracles? 305 Dr. Lew Graham 19-Mar-13 00:30
Re: A Miracle? 243 PB Bytes 19-Mar-13 00:47
Typo 341 Dr. Lew Graham 19-Mar-13 01:00
Sarcasm? 318 Sirius7237 19-Mar-13 03:04
More Hypocrisy 326 loveritas 19-Mar-13 05:32
Re: Typo 301 PB Bytes 19-Mar-13 03:26
yes, maybe thinking is not ultimate ground of being 315 Thomas Brophy 18-Mar-13 23:03
Re: yes, maybe thinking is not ultimate ground of being 327 cladking 19-Mar-13 02:16
I addressed your question on Zep Tepi, no? 318 Thomas Brophy 18-Mar-13 04:41
Re: I addressed your question on Zep Tepi, no? 327 loveritas 18-Mar-13 06:07
Re: I addressed your question on Zep Tepi, no? 396 Thomas Brophy 18-Mar-13 22:30
Re: I addressed your question on Zep Tepi, no? 362 loveritas 18-Mar-13 22:38
I'll Rephrase the Question 339 loveritas 19-Mar-13 20:42
Re: I'll Rephrase the Question 335 Aine 19-Mar-13 21:37
Re: I'll Rephrase the Question 333 loveritas 20-Mar-13 11:54
Re: I'll Rephrase the Question 346 Thomas Brophy 20-Mar-13 17:47
Re: I'll Rephrase the Question 352 Thunderbird 20-Mar-13 18:29
Re: I'll Rephrase the Question 330 loveritas 20-Mar-13 21:33
Re: I'll Rephrase the Question 321 Spiros 20-Mar-13 22:13
Re: I'll Rephrase the Question 364 Laird Scranton 21-Mar-13 16:50
Re: I'll Rephrase the Question 365 Spiros 21-Mar-13 19:16
Re: I'll Rephrase the Question 355 Audrey 24-Mar-13 04:25
Re: I'll Rephrase the Question 324 Thomas Brophy 24-Mar-13 06:10
Re: I'll Rephrase the Question 284 loveritas 24-Mar-13 06:54
Starry Night Pro calculation still not clarified 374 Thomas Brophy 29-Mar-13 22:02
Re: Starry Night Pro calculation still not clarified 344 loveritas 30-Mar-13 02:05
Re: What if?...... 309 Thunderbird 30-Mar-13 20:56
Re: What if?...... 307 loveritas 30-Mar-13 23:55
Re: Zawiyet el-Aryan meridian observation shaft/Water clock 562 Thunderbird 31-Mar-13 03:37
Re: Zawiyet el-Aryan meridian observation shaft/Water clock 339 loveritas 31-Mar-13 07:56
Bond of Heaven and Earth 500 loveritas 01-Apr-13 01:25
Djed-raising ropes? 345 Thomas Brophy 01-Apr-13 01:40
Re: Djed-raising ropes? 348 loveritas 01-Apr-13 05:18
Re: Djed-raising ropes? 325 Thomas Brophy 01-Apr-13 06:47
Re: Djed-raising ropes? 344 loveritas 01-Apr-13 06:58
Re: Djed-raising ropes? 332 Thomas Brophy 01-Apr-13 07:05
Re: Djed-raising ropes? 318 loveritas 01-Apr-13 07:11
Re: Djed-raising ropes? 348 Thomas Brophy 01-Apr-13 07:24
Re: Ability....and transitions of time. 337 Thunderbird 01-Apr-13 23:19
Re: Ability....and transitions of time. 314 loveritas 01-Apr-13 23:53
Re: King and Queen Ascending/Descending 402 Thunderbird 02-Apr-13 20:07
Re: King and Queen Ascending/Descending 303 loveritas 02-Apr-13 22:37
Re: Bond of Heaven and Earth 360 Thunderbird 01-Apr-13 03:55
Some basics... 349 Thomas Brophy 31-Mar-13 00:16
Re: Starry Night Pro calculation still not clarified 350 Spiros 30-Mar-13 06:30
Help ask Starry Night 324 Thomas Brophy 31-Mar-13 00:58
Re: Help ask Starry Night 406 Spiros 31-Mar-13 17:58
Starry Night Pro 'fesses up to precession calculation errors 932 Thomas Brophy 02-Apr-13 19:29
Re: Starry Night Pro 'fesses up to precession calculation errors 389 Spiros 02-Apr-13 20:59
Re: Starry Night Pro 'fesses up to precession calculation errors 323 Thomas Brophy 02-Apr-13 21:22
Starry Night Pro precession calculation fix delayed 396 Thomas Brophy 10-May-13 22:39
Re: Starry Night Pro precession calculation fix delayed 348 loveritas 11-May-13 01:22
Re: Starry Night Pro precession calculation fix delayed 328 Spiros 13-May-13 22:10
What is your culminating declination? 333 Thomas Brophy 13-May-13 22:49
Re: What is your culminating declination? 316 Spiros 13-May-13 23:27
Re: What is your culminating declination? 339 Thomas Brophy 14-May-13 00:13
Re: What is your culminating declination? 288 Spiros 19-May-13 01:31
Re: I'll Rephrase the Question 416 Thomas Brophy 21-Mar-13 04:20
Einstein Not Necessary 315 loveritas 21-Mar-13 06:37
Memory & Einstein 312 loveritas 24-Mar-13 23:10
Re: Memory & Einstein 362 Thomas Brophy 24-Mar-13 23:43
Re: Zep Tepi 328 Eddie Larry 14-May-13 03:45
Re: Zep Tepi 332 Sirfiroth 15-May-13 02:15
Re: Zep Tepi 292 Eddie Larry 15-May-13 03:02

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