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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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Re: Zep Tepi 296 PB Bytes 08-Mar-13 15:17
Re: Zep Tepi 291 loveritas 08-Mar-13 20:31
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Re: Mostly offline next couple of days 265 loveritas 09-Mar-13 00:34
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Re: GHMB 'Decorum' and Other Issues 302 Thomas Brophy 16-Mar-13 20:18
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and self righteous arrogance 306 Sirius7237 16-Mar-13 22:18
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Re: Relying Upon One's Discernment 830 cladking 18-Mar-13 20:58
Atrophy of Discernment 339 Dr. Lew Graham 18-Mar-13 21:34
Re: Atrophy of Discernment 341 cladking 18-Mar-13 21:59
A Miracle? 319 Dr. Lew Graham 18-Mar-13 23:42
Accidently hit "quote" instead of post and failed to correct 326 cladking 19-Mar-13 00:20
Miracles? 284 Dr. Lew Graham 19-Mar-13 00:30
Re: A Miracle? 218 PB Bytes 19-Mar-13 00:47
Typo 322 Dr. Lew Graham 19-Mar-13 01:00
Sarcasm? 299 Sirius7237 19-Mar-13 03:04
More Hypocrisy 303 loveritas 19-Mar-13 05:32
Re: Typo 282 PB Bytes 19-Mar-13 03:26
yes, maybe thinking is not ultimate ground of being 294 Thomas Brophy 18-Mar-13 23:03
Re: yes, maybe thinking is not ultimate ground of being 308 cladking 19-Mar-13 02:16
I addressed your question on Zep Tepi, no? 292 Thomas Brophy 18-Mar-13 04:41
Re: I addressed your question on Zep Tepi, no? 307 loveritas 18-Mar-13 06:07
Re: I addressed your question on Zep Tepi, no? 374 Thomas Brophy 18-Mar-13 22:30
Re: I addressed your question on Zep Tepi, no? 341 loveritas 18-Mar-13 22:38
I'll Rephrase the Question 318 loveritas 19-Mar-13 20:42
Re: I'll Rephrase the Question 313 Aine 19-Mar-13 21:37
Re: I'll Rephrase the Question 316 loveritas 20-Mar-13 11:54
Re: I'll Rephrase the Question 323 Thomas Brophy 20-Mar-13 17:47
Re: I'll Rephrase the Question 331 Thunderbird 20-Mar-13 18:29
Re: I'll Rephrase the Question 309 loveritas 20-Mar-13 21:33
Re: I'll Rephrase the Question 301 Spiros 20-Mar-13 22:13
Re: I'll Rephrase the Question 340 Laird Scranton 21-Mar-13 16:50
Re: I'll Rephrase the Question 345 Spiros 21-Mar-13 19:16
Re: I'll Rephrase the Question 335 Audrey 24-Mar-13 04:25
Re: I'll Rephrase the Question 302 Thomas Brophy 24-Mar-13 06:10
Re: I'll Rephrase the Question 264 loveritas 24-Mar-13 06:54
Starry Night Pro calculation still not clarified 349 Thomas Brophy 29-Mar-13 22:02
Re: Starry Night Pro calculation still not clarified 324 loveritas 30-Mar-13 02:05
Re: What if?...... 288 Thunderbird 30-Mar-13 20:56
Re: What if?...... 284 loveritas 30-Mar-13 23:55
Re: Zawiyet el-Aryan meridian observation shaft/Water clock 536 Thunderbird 31-Mar-13 03:37
Re: Zawiyet el-Aryan meridian observation shaft/Water clock 317 loveritas 31-Mar-13 07:56
Bond of Heaven and Earth 475 loveritas 01-Apr-13 01:25
Djed-raising ropes? 322 Thomas Brophy 01-Apr-13 01:40
Re: Djed-raising ropes? 331 loveritas 01-Apr-13 05:18
Re: Djed-raising ropes? 300 Thomas Brophy 01-Apr-13 06:47
Re: Djed-raising ropes? 324 loveritas 01-Apr-13 06:58
Re: Djed-raising ropes? 309 Thomas Brophy 01-Apr-13 07:05
Re: Djed-raising ropes? 294 loveritas 01-Apr-13 07:11
Re: Djed-raising ropes? 318 Thomas Brophy 01-Apr-13 07:24
Re: Ability....and transitions of time. 316 Thunderbird 01-Apr-13 23:19
Re: Ability....and transitions of time. 292 loveritas 01-Apr-13 23:53
Re: King and Queen Ascending/Descending 380 Thunderbird 02-Apr-13 20:07
Re: King and Queen Ascending/Descending 283 loveritas 02-Apr-13 22:37
Re: Bond of Heaven and Earth 340 Thunderbird 01-Apr-13 03:55
Some basics... 325 Thomas Brophy 31-Mar-13 00:16
Re: Starry Night Pro calculation still not clarified 330 Spiros 30-Mar-13 06:30
Help ask Starry Night 303 Thomas Brophy 31-Mar-13 00:58
Re: Help ask Starry Night 386 Spiros 31-Mar-13 17:58
Starry Night Pro 'fesses up to precession calculation errors 883 Thomas Brophy 02-Apr-13 19:29
Re: Starry Night Pro 'fesses up to precession calculation errors 368 Spiros 02-Apr-13 20:59
Re: Starry Night Pro 'fesses up to precession calculation errors 302 Thomas Brophy 02-Apr-13 21:22
Starry Night Pro precession calculation fix delayed 372 Thomas Brophy 10-May-13 22:39
Re: Starry Night Pro precession calculation fix delayed 325 loveritas 11-May-13 01:22
Re: Starry Night Pro precession calculation fix delayed 310 Spiros 13-May-13 22:10
What is your culminating declination? 306 Thomas Brophy 13-May-13 22:49
Re: What is your culminating declination? 292 Spiros 13-May-13 23:27
Re: What is your culminating declination? 315 Thomas Brophy 14-May-13 00:13
Re: What is your culminating declination? 265 Spiros 19-May-13 01:31
Re: I'll Rephrase the Question 396 Thomas Brophy 21-Mar-13 04:20
Einstein Not Necessary 296 loveritas 21-Mar-13 06:37
Memory & Einstein 293 loveritas 24-Mar-13 23:10
Re: Memory & Einstein 332 Thomas Brophy 24-Mar-13 23:43
Re: Zep Tepi 301 Eddie Larry 14-May-13 03:45
Re: Zep Tepi 312 Sirfiroth 15-May-13 02:15
Re: Zep Tepi 272 Eddie Larry 15-May-13 03:02


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