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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 348 loveritas 07-Mar-13 11:01
Re: Zep Tepi 198 Poster Boy 08-Mar-13 15:17
Re: Zep Tepi 213 loveritas 08-Mar-13 20:31
Mostly offline next couple of days 216 Thomas Brophy 08-Mar-13 23:57
Re: Mostly offline next couple of days 177 loveritas 09-Mar-13 00:34
Re:the waves of which dashed in powerless fury against its base. 213 Thunderbird 10-Mar-13 20:18
Nice To See You're Back 234 loveritas 12-Mar-13 04:22
Re: Nice To See You're Back 223 Thomas Brophy 16-Mar-13 04:52
GHMB 'Decorum' and Other Issues 195 Dr. Lew Graham 16-Mar-13 14:03
Re: GHMB 'Decorum' and Other Issues 216 Thomas Brophy 16-Mar-13 20:18
High on Ego 189 loveritas 16-Mar-13 21:59
and self righteous arrogance 226 Sirius7237 16-Mar-13 22:18
Re: GHMB 'Decorum' and Other Issues 228 Bobajot 17-Mar-13 02:15
Re: GHMB 'Decorum' and Other Issues 206 Aine 17-Mar-13 22:04
Relying Upon One's Discernment 254 Dr. Lew Graham 18-Mar-13 01:35
Re: Relying Upon One's Discernment 725 cladking 18-Mar-13 20:58
Atrophy of Discernment 237 Dr. Lew Graham 18-Mar-13 21:34
Re: Atrophy of Discernment 249 cladking 18-Mar-13 21:59
A Miracle? 233 Dr. Lew Graham 18-Mar-13 23:42
Accidently hit "quote" instead of post and failed to correct 236 cladking 19-Mar-13 00:20
Miracles? 205 Dr. Lew Graham 19-Mar-13 00:30
Re: A Miracle? 144 Poster Boy 19-Mar-13 00:47
Typo 232 Dr. Lew Graham 19-Mar-13 01:00
Sarcasm? 212 Sirius7237 19-Mar-13 03:04
More Hypocrisy 218 loveritas 19-Mar-13 05:32
Re: Typo 192 Poster Boy 19-Mar-13 03:26
yes, maybe thinking is not ultimate ground of being 191 Thomas Brophy 18-Mar-13 23:03
Re: yes, maybe thinking is not ultimate ground of being 225 cladking 19-Mar-13 02:16
I addressed your question on Zep Tepi, no? 195 Thomas Brophy 18-Mar-13 04:41
Re: I addressed your question on Zep Tepi, no? 218 loveritas 18-Mar-13 06:07
Re: I addressed your question on Zep Tepi, no? 276 Thomas Brophy 18-Mar-13 22:30
Re: I addressed your question on Zep Tepi, no? 250 loveritas 18-Mar-13 22:38
I'll Rephrase the Question 233 loveritas 19-Mar-13 20:42
Re: I'll Rephrase the Question 225 Aine 19-Mar-13 21:37
Re: I'll Rephrase the Question 219 loveritas 20-Mar-13 11:54
Re: I'll Rephrase the Question 229 Thomas Brophy 20-Mar-13 17:47
Re: I'll Rephrase the Question 232 Thunderbird 20-Mar-13 18:29
Re: I'll Rephrase the Question 210 loveritas 20-Mar-13 21:33
Re: I'll Rephrase the Question 213 Spiros 20-Mar-13 22:13
Re: I'll Rephrase the Question 236 Laird Scranton 21-Mar-13 16:50
Re: I'll Rephrase the Question 259 Spiros 21-Mar-13 19:16
Re: I'll Rephrase the Question 244 Audrey 24-Mar-13 04:25
Re: I'll Rephrase the Question 209 Thomas Brophy 24-Mar-13 06:10
Re: I'll Rephrase the Question 183 loveritas 24-Mar-13 06:54
Starry Night Pro calculation still not clarified 254 Thomas Brophy 29-Mar-13 22:02
Re: Starry Night Pro calculation still not clarified 234 loveritas 30-Mar-13 02:05
Re: What if?...... 196 Thunderbird 30-Mar-13 20:56
Re: What if?...... 207 loveritas 30-Mar-13 23:55
Re: Zawiyet el-Aryan meridian observation shaft/Water clock 394 Thunderbird 31-Mar-13 03:37
Re: Zawiyet el-Aryan meridian observation shaft/Water clock 225 loveritas 31-Mar-13 07:56
Bond of Heaven and Earth 373 loveritas 01-Apr-13 01:25
Djed-raising ropes? 230 Thomas Brophy 01-Apr-13 01:40
Re: Djed-raising ropes? 231 loveritas 01-Apr-13 05:18
Re: Djed-raising ropes? 223 Thomas Brophy 01-Apr-13 06:47
Re: Djed-raising ropes? 235 loveritas 01-Apr-13 06:58
Re: Djed-raising ropes? 222 Thomas Brophy 01-Apr-13 07:05
Re: Djed-raising ropes? 208 loveritas 01-Apr-13 07:11
Re: Djed-raising ropes? 234 Thomas Brophy 01-Apr-13 07:24
Re: Ability....and transitions of time. 220 Thunderbird 01-Apr-13 23:19
Re: Ability....and transitions of time. 201 loveritas 01-Apr-13 23:53
Re: King and Queen Ascending/Descending 267 Thunderbird 02-Apr-13 20:07
Re: King and Queen Ascending/Descending 200 loveritas 02-Apr-13 22:37
Re: Bond of Heaven and Earth 243 Thunderbird 01-Apr-13 03:55
Some basics... 234 Thomas Brophy 31-Mar-13 00:16
Re: Starry Night Pro calculation still not clarified 237 Spiros 30-Mar-13 06:30
Help ask Starry Night 220 Thomas Brophy 31-Mar-13 00:58
Re: Help ask Starry Night 271 Spiros 31-Mar-13 17:58
Starry Night Pro 'fesses up to precession calculation errors 665 Thomas Brophy 02-Apr-13 19:29
Re: Starry Night Pro 'fesses up to precession calculation errors 280 Spiros 02-Apr-13 20:59
Re: Starry Night Pro 'fesses up to precession calculation errors 212 Thomas Brophy 02-Apr-13 21:22
Starry Night Pro precession calculation fix delayed 270 Thomas Brophy 10-May-13 22:39
Re: Starry Night Pro precession calculation fix delayed 233 loveritas 11-May-13 01:22
Re: Starry Night Pro precession calculation fix delayed 229 Spiros 13-May-13 22:10
What is your culminating declination? 219 Thomas Brophy 13-May-13 22:49
Re: What is your culminating declination? 216 Spiros 13-May-13 23:27
Re: What is your culminating declination? 232 Thomas Brophy 14-May-13 00:13
Re: What is your culminating declination? 184 Spiros 19-May-13 01:31
Re: I'll Rephrase the Question 293 Thomas Brophy 21-Mar-13 04:20
Einstein Not Necessary 207 loveritas 21-Mar-13 06:37
Memory & Einstein 211 loveritas 24-Mar-13 23:10
Re: Memory & Einstein 232 Thomas Brophy 24-Mar-13 23:43
Re: Zep Tepi 209 Eddie Larry 14-May-13 03:45
Re: Zep Tepi 211 Sirfiroth 15-May-13 02:15
Re: Zep Tepi 193 Eddie Larry 15-May-13 03:02


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