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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 375 loveritas 07-Mar-13 11:01
Re: Zep Tepi 231 Poster Boy 08-Mar-13 15:17
Re: Zep Tepi 230 loveritas 08-Mar-13 20:31
Mostly offline next couple of days 264 Thomas Brophy 08-Mar-13 23:57
Re: Mostly offline next couple of days 209 loveritas 09-Mar-13 00:34
Re:the waves of which dashed in powerless fury against its base. 240 Thunderbird 10-Mar-13 20:18
Nice To See You're Back 260 loveritas 12-Mar-13 04:22
Re: Nice To See You're Back 245 Thomas Brophy 16-Mar-13 04:52
GHMB 'Decorum' and Other Issues 232 Dr. Lew Graham 16-Mar-13 14:03
Re: GHMB 'Decorum' and Other Issues 240 Thomas Brophy 16-Mar-13 20:18
High on Ego 208 loveritas 16-Mar-13 21:59
and self righteous arrogance 244 Sirius7237 16-Mar-13 22:18
Re: GHMB 'Decorum' and Other Issues 256 Bobajot 17-Mar-13 02:15
Re: GHMB 'Decorum' and Other Issues 232 Aine 17-Mar-13 22:04
Relying Upon One's Discernment 281 Dr. Lew Graham 18-Mar-13 01:35
Re: Relying Upon One's Discernment 753 cladking 18-Mar-13 20:58
Atrophy of Discernment 278 Dr. Lew Graham 18-Mar-13 21:34
Re: Atrophy of Discernment 274 cladking 18-Mar-13 21:59
A Miracle? 264 Dr. Lew Graham 18-Mar-13 23:42
Accidently hit "quote" instead of post and failed to correct 263 cladking 19-Mar-13 00:20
Miracles? 229 Dr. Lew Graham 19-Mar-13 00:30
Re: A Miracle? 161 Poster Boy 19-Mar-13 00:47
Typo 263 Dr. Lew Graham 19-Mar-13 01:00
Sarcasm? 235 Sirius7237 19-Mar-13 03:04
More Hypocrisy 239 loveritas 19-Mar-13 05:32
Re: Typo 217 Poster Boy 19-Mar-13 03:26
yes, maybe thinking is not ultimate ground of being 213 Thomas Brophy 18-Mar-13 23:03
Re: yes, maybe thinking is not ultimate ground of being 245 cladking 19-Mar-13 02:16
I addressed your question on Zep Tepi, no? 232 Thomas Brophy 18-Mar-13 04:41
Re: I addressed your question on Zep Tepi, no? 249 loveritas 18-Mar-13 06:07
Re: I addressed your question on Zep Tepi, no? 299 Thomas Brophy 18-Mar-13 22:30
Re: I addressed your question on Zep Tepi, no? 276 loveritas 18-Mar-13 22:38
I'll Rephrase the Question 254 loveritas 19-Mar-13 20:42
Re: I'll Rephrase the Question 248 Aine 19-Mar-13 21:37
Re: I'll Rephrase the Question 246 loveritas 20-Mar-13 11:54
Re: I'll Rephrase the Question 254 Thomas Brophy 20-Mar-13 17:47
Re: I'll Rephrase the Question 259 Thunderbird 20-Mar-13 18:29
Re: I'll Rephrase the Question 246 loveritas 20-Mar-13 21:33
Re: I'll Rephrase the Question 242 Spiros 20-Mar-13 22:13
Re: I'll Rephrase the Question 276 Laird Scranton 21-Mar-13 16:50
Re: I'll Rephrase the Question 281 Spiros 21-Mar-13 19:16
Re: I'll Rephrase the Question 270 Audrey 24-Mar-13 04:25
Re: I'll Rephrase the Question 237 Thomas Brophy 24-Mar-13 06:10
Re: I'll Rephrase the Question 202 loveritas 24-Mar-13 06:54
Starry Night Pro calculation still not clarified 286 Thomas Brophy 29-Mar-13 22:02
Re: Starry Night Pro calculation still not clarified 257 loveritas 30-Mar-13 02:05
Re: What if?...... 221 Thunderbird 30-Mar-13 20:56
Re: What if?...... 226 loveritas 30-Mar-13 23:55
Re: Zawiyet el-Aryan meridian observation shaft/Water clock 433 Thunderbird 31-Mar-13 03:37
Re: Zawiyet el-Aryan meridian observation shaft/Water clock 250 loveritas 31-Mar-13 07:56
Bond of Heaven and Earth 389 loveritas 01-Apr-13 01:25
Djed-raising ropes? 252 Thomas Brophy 01-Apr-13 01:40
Re: Djed-raising ropes? 267 loveritas 01-Apr-13 05:18
Re: Djed-raising ropes? 242 Thomas Brophy 01-Apr-13 06:47
Re: Djed-raising ropes? 268 loveritas 01-Apr-13 06:58
Re: Djed-raising ropes? 244 Thomas Brophy 01-Apr-13 07:05
Re: Djed-raising ropes? 229 loveritas 01-Apr-13 07:11
Re: Djed-raising ropes? 259 Thomas Brophy 01-Apr-13 07:24
Re: Ability....and transitions of time. 251 Thunderbird 01-Apr-13 23:19
Re: Ability....and transitions of time. 226 loveritas 01-Apr-13 23:53
Re: King and Queen Ascending/Descending 300 Thunderbird 02-Apr-13 20:07
Re: King and Queen Ascending/Descending 217 loveritas 02-Apr-13 22:37
Re: Bond of Heaven and Earth 266 Thunderbird 01-Apr-13 03:55
Some basics... 261 Thomas Brophy 31-Mar-13 00:16
Re: Starry Night Pro calculation still not clarified 262 Spiros 30-Mar-13 06:30
Help ask Starry Night 243 Thomas Brophy 31-Mar-13 00:58
Re: Help ask Starry Night 305 Spiros 31-Mar-13 17:58
Starry Night Pro 'fesses up to precession calculation errors 715 Thomas Brophy 02-Apr-13 19:29
Re: Starry Night Pro 'fesses up to precession calculation errors 301 Spiros 02-Apr-13 20:59
Re: Starry Night Pro 'fesses up to precession calculation errors 238 Thomas Brophy 02-Apr-13 21:22
Starry Night Pro precession calculation fix delayed 301 Thomas Brophy 10-May-13 22:39
Re: Starry Night Pro precession calculation fix delayed 264 loveritas 11-May-13 01:22
Re: Starry Night Pro precession calculation fix delayed 248 Spiros 13-May-13 22:10
What is your culminating declination? 243 Thomas Brophy 13-May-13 22:49
Re: What is your culminating declination? 232 Spiros 13-May-13 23:27
Re: What is your culminating declination? 253 Thomas Brophy 14-May-13 00:13
Re: What is your culminating declination? 199 Spiros 19-May-13 01:31
Re: I'll Rephrase the Question 327 Thomas Brophy 21-Mar-13 04:20
Einstein Not Necessary 228 loveritas 21-Mar-13 06:37
Memory & Einstein 235 loveritas 24-Mar-13 23:10
Re: Memory & Einstein 266 Thomas Brophy 24-Mar-13 23:43
Re: Zep Tepi 239 Eddie Larry 14-May-13 03:45
Re: Zep Tepi 249 Sirfiroth 15-May-13 02:15
Re: Zep Tepi 214 Eddie Larry 15-May-13 03:02


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