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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 340 loveritas 07-Mar-13 11:01
Re: Zep Tepi 190 Poster Boy 08-Mar-13 15:17
Re: Zep Tepi 208 loveritas 08-Mar-13 20:31
Mostly offline next couple of days 210 Thomas Brophy 08-Mar-13 23:57
Re: Mostly offline next couple of days 173 loveritas 09-Mar-13 00:34
Re:the waves of which dashed in powerless fury against its base. 205 Thunderbird 10-Mar-13 20:18
Nice To See You're Back 229 loveritas 12-Mar-13 04:22
Re: Nice To See You're Back 216 Thomas Brophy 16-Mar-13 04:52
GHMB 'Decorum' and Other Issues 188 Dr. Lew Graham 16-Mar-13 14:03
Re: GHMB 'Decorum' and Other Issues 209 Thomas Brophy 16-Mar-13 20:18
High on Ego 183 loveritas 16-Mar-13 21:59
and self righteous arrogance 221 Sirius7237 16-Mar-13 22:18
Re: GHMB 'Decorum' and Other Issues 218 Bobajot 17-Mar-13 02:15
Re: GHMB 'Decorum' and Other Issues 199 Aine 17-Mar-13 22:04
Relying Upon One's Discernment 248 Dr. Lew Graham 18-Mar-13 01:35
Re: Relying Upon One's Discernment 720 cladking 18-Mar-13 20:58
Atrophy of Discernment 231 Dr. Lew Graham 18-Mar-13 21:34
Re: Atrophy of Discernment 244 cladking 18-Mar-13 21:59
A Miracle? 228 Dr. Lew Graham 18-Mar-13 23:42
Accidently hit "quote" instead of post and failed to correct 229 cladking 19-Mar-13 00:20
Miracles? 200 Dr. Lew Graham 19-Mar-13 00:30
Re: A Miracle? 139 Poster Boy 19-Mar-13 00:47
Typo 225 Dr. Lew Graham 19-Mar-13 01:00
Sarcasm? 204 Sirius7237 19-Mar-13 03:04
More Hypocrisy 211 loveritas 19-Mar-13 05:32
Re: Typo 186 Poster Boy 19-Mar-13 03:26
yes, maybe thinking is not ultimate ground of being 187 Thomas Brophy 18-Mar-13 23:03
Re: yes, maybe thinking is not ultimate ground of being 220 cladking 19-Mar-13 02:16
I addressed your question on Zep Tepi, no? 190 Thomas Brophy 18-Mar-13 04:41
Re: I addressed your question on Zep Tepi, no? 212 loveritas 18-Mar-13 06:07
Re: I addressed your question on Zep Tepi, no? 268 Thomas Brophy 18-Mar-13 22:30
Re: I addressed your question on Zep Tepi, no? 237 loveritas 18-Mar-13 22:38
I'll Rephrase the Question 227 loveritas 19-Mar-13 20:42
Re: I'll Rephrase the Question 221 Aine 19-Mar-13 21:37
Re: I'll Rephrase the Question 214 loveritas 20-Mar-13 11:54
Re: I'll Rephrase the Question 222 Thomas Brophy 20-Mar-13 17:47
Re: I'll Rephrase the Question 225 Thunderbird 20-Mar-13 18:29
Re: I'll Rephrase the Question 203 loveritas 20-Mar-13 21:33
Re: I'll Rephrase the Question 208 Spiros 20-Mar-13 22:13
Re: I'll Rephrase the Question 231 Laird Scranton 21-Mar-13 16:50
Re: I'll Rephrase the Question 253 Spiros 21-Mar-13 19:16
Re: I'll Rephrase the Question 230 Audrey 24-Mar-13 04:25
Re: I'll Rephrase the Question 202 Thomas Brophy 24-Mar-13 06:10
Re: I'll Rephrase the Question 178 loveritas 24-Mar-13 06:54
Starry Night Pro calculation still not clarified 245 Thomas Brophy 29-Mar-13 22:02
Re: Starry Night Pro calculation still not clarified 225 loveritas 30-Mar-13 02:05
Re: What if?...... 191 Thunderbird 30-Mar-13 20:56
Re: What if?...... 203 loveritas 30-Mar-13 23:55
Re: Zawiyet el-Aryan meridian observation shaft/Water clock 380 Thunderbird 31-Mar-13 03:37
Re: Zawiyet el-Aryan meridian observation shaft/Water clock 220 loveritas 31-Mar-13 07:56
Bond of Heaven and Earth 367 loveritas 01-Apr-13 01:25
Djed-raising ropes? 223 Thomas Brophy 01-Apr-13 01:40
Re: Djed-raising ropes? 226 loveritas 01-Apr-13 05:18
Re: Djed-raising ropes? 218 Thomas Brophy 01-Apr-13 06:47
Re: Djed-raising ropes? 229 loveritas 01-Apr-13 06:58
Re: Djed-raising ropes? 218 Thomas Brophy 01-Apr-13 07:05
Re: Djed-raising ropes? 202 loveritas 01-Apr-13 07:11
Re: Djed-raising ropes? 227 Thomas Brophy 01-Apr-13 07:24
Re: Ability....and transitions of time. 214 Thunderbird 01-Apr-13 23:19
Re: Ability....and transitions of time. 194 loveritas 01-Apr-13 23:53
Re: King and Queen Ascending/Descending 259 Thunderbird 02-Apr-13 20:07
Re: King and Queen Ascending/Descending 194 loveritas 02-Apr-13 22:37
Re: Bond of Heaven and Earth 236 Thunderbird 01-Apr-13 03:55
Some basics... 228 Thomas Brophy 31-Mar-13 00:16
Re: Starry Night Pro calculation still not clarified 225 Spiros 30-Mar-13 06:30
Help ask Starry Night 214 Thomas Brophy 31-Mar-13 00:58
Re: Help ask Starry Night 264 Spiros 31-Mar-13 17:58
Starry Night Pro 'fesses up to precession calculation errors 655 Thomas Brophy 02-Apr-13 19:29
Re: Starry Night Pro 'fesses up to precession calculation errors 269 Spiros 02-Apr-13 20:59
Re: Starry Night Pro 'fesses up to precession calculation errors 205 Thomas Brophy 02-Apr-13 21:22
Starry Night Pro precession calculation fix delayed 262 Thomas Brophy 10-May-13 22:39
Re: Starry Night Pro precession calculation fix delayed 228 loveritas 11-May-13 01:22
Re: Starry Night Pro precession calculation fix delayed 220 Spiros 13-May-13 22:10
What is your culminating declination? 211 Thomas Brophy 13-May-13 22:49
Re: What is your culminating declination? 209 Spiros 13-May-13 23:27
Re: What is your culminating declination? 221 Thomas Brophy 14-May-13 00:13
Re: What is your culminating declination? 174 Spiros 19-May-13 01:31
Re: I'll Rephrase the Question 280 Thomas Brophy 21-Mar-13 04:20
Einstein Not Necessary 201 loveritas 21-Mar-13 06:37
Memory & Einstein 204 loveritas 24-Mar-13 23:10
Re: Memory & Einstein 223 Thomas Brophy 24-Mar-13 23:43
Re: Zep Tepi 202 Eddie Larry 14-May-13 03:45
Re: Zep Tepi 205 Sirfiroth 15-May-13 02:15
Re: Zep Tepi 189 Eddie Larry 15-May-13 03:02


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