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Hi Ogygos,
Re: "Does this mean that a star's declination for instance that of Vega at 8000 BC can be off by a whopping 2.6 degrees?"
--No, I don't think that much off. What that table is doing, is comparing the polynomial expansion methods, taken out to differing extents (T**10 instead of T**6), so the long times have much bigger errors. I think the early versions of Starry Night were off by that much, but the newer versions are better by that much. But as Starry Night said today, they found errors in the newer version too.

The problems actually arise, generally, because Starry Night uses the polynomial expansion method, instead of the Fourier expansion method. The former can be extremely accurate for years/millennia around the present but then fall off rapidly over long times, if they are not careful. Starry Night says they now use the Method of Williams (1994), but I am reading that paper and he also says Williams (1994) says, “The polynomial expressions in Table 5 can be used for times extending out to a few millennia, but are not suitable for longer times. The polynomials are equivalent to expansions of expressions appropriate for longer times: an average precession rate and obliquity plus long-preiodic, or at least quasiperiodic, terms with periods exceeding 10,000 yr (Berger 1976; Laskar et al. 1993). ...”

Berger 1976, as I told Starry Night, is the method I use. We'll have to see what Starry Night comes out with in their fix. I think, for Vega circa 12000 BC, they will find the correct declination is closer to the value I quoted (about 0.3 degrees higher), but we'll see...


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Subject Views Written By Posted
Zep Tepi 363 loveritas 07-Mar-13 11:01
Re: Zep Tepi 210 Poster Boy 08-Mar-13 15:17
Re: Zep Tepi 221 loveritas 08-Mar-13 20:31
Mostly offline next couple of days 234 Thomas Brophy 08-Mar-13 23:57
Re: Mostly offline next couple of days 187 loveritas 09-Mar-13 00:34
Re:the waves of which dashed in powerless fury against its base. 224 Thunderbird 10-Mar-13 20:18
Nice To See You're Back 248 loveritas 12-Mar-13 04:22
Re: Nice To See You're Back 235 Thomas Brophy 16-Mar-13 04:52
GHMB 'Decorum' and Other Issues 208 Dr. Lew Graham 16-Mar-13 14:03
Re: GHMB 'Decorum' and Other Issues 228 Thomas Brophy 16-Mar-13 20:18
High on Ego 198 loveritas 16-Mar-13 21:59
and self righteous arrogance 234 Sirius7237 16-Mar-13 22:18
Re: GHMB 'Decorum' and Other Issues 246 Bobajot 17-Mar-13 02:15
Re: GHMB 'Decorum' and Other Issues 220 Aine 17-Mar-13 22:04
Relying Upon One's Discernment 269 Dr. Lew Graham 18-Mar-13 01:35
Re: Relying Upon One's Discernment 736 cladking 18-Mar-13 20:58
Atrophy of Discernment 246 Dr. Lew Graham 18-Mar-13 21:34
Re: Atrophy of Discernment 261 cladking 18-Mar-13 21:59
A Miracle? 243 Dr. Lew Graham 18-Mar-13 23:42
Accidently hit "quote" instead of post and failed to correct 245 cladking 19-Mar-13 00:20
Miracles? 212 Dr. Lew Graham 19-Mar-13 00:30
Re: A Miracle? 151 Poster Boy 19-Mar-13 00:47
Typo 242 Dr. Lew Graham 19-Mar-13 01:00
Sarcasm? 220 Sirius7237 19-Mar-13 03:04
More Hypocrisy 229 loveritas 19-Mar-13 05:32
Re: Typo 204 Poster Boy 19-Mar-13 03:26
yes, maybe thinking is not ultimate ground of being 200 Thomas Brophy 18-Mar-13 23:03
Re: yes, maybe thinking is not ultimate ground of being 232 cladking 19-Mar-13 02:16
I addressed your question on Zep Tepi, no? 206 Thomas Brophy 18-Mar-13 04:41
Re: I addressed your question on Zep Tepi, no? 230 loveritas 18-Mar-13 06:07
Re: I addressed your question on Zep Tepi, no? 287 Thomas Brophy 18-Mar-13 22:30
Re: I addressed your question on Zep Tepi, no? 265 loveritas 18-Mar-13 22:38
I'll Rephrase the Question 240 loveritas 19-Mar-13 20:42
Re: I'll Rephrase the Question 233 Aine 19-Mar-13 21:37
Re: I'll Rephrase the Question 228 loveritas 20-Mar-13 11:54
Re: I'll Rephrase the Question 240 Thomas Brophy 20-Mar-13 17:47
Re: I'll Rephrase the Question 244 Thunderbird 20-Mar-13 18:29
Re: I'll Rephrase the Question 224 loveritas 20-Mar-13 21:33
Re: I'll Rephrase the Question 224 Spiros 20-Mar-13 22:13
Re: I'll Rephrase the Question 246 Laird Scranton 21-Mar-13 16:50
Re: I'll Rephrase the Question 267 Spiros 21-Mar-13 19:16
Re: I'll Rephrase the Question 258 Audrey 24-Mar-13 04:25
Re: I'll Rephrase the Question 219 Thomas Brophy 24-Mar-13 06:10
Re: I'll Rephrase the Question 191 loveritas 24-Mar-13 06:54
Starry Night Pro calculation still not clarified 266 Thomas Brophy 29-Mar-13 22:02
Re: Starry Night Pro calculation still not clarified 245 loveritas 30-Mar-13 02:05
Re: What if?...... 206 Thunderbird 30-Mar-13 20:56
Re: What if?...... 217 loveritas 30-Mar-13 23:55
Re: Zawiyet el-Aryan meridian observation shaft/Water clock 413 Thunderbird 31-Mar-13 03:37
Re: Zawiyet el-Aryan meridian observation shaft/Water clock 234 loveritas 31-Mar-13 07:56
Bond of Heaven and Earth 378 loveritas 01-Apr-13 01:25
Djed-raising ropes? 239 Thomas Brophy 01-Apr-13 01:40
Re: Djed-raising ropes? 241 loveritas 01-Apr-13 05:18
Re: Djed-raising ropes? 233 Thomas Brophy 01-Apr-13 06:47
Re: Djed-raising ropes? 255 loveritas 01-Apr-13 06:58
Re: Djed-raising ropes? 231 Thomas Brophy 01-Apr-13 07:05
Re: Djed-raising ropes? 217 loveritas 01-Apr-13 07:11
Re: Djed-raising ropes? 246 Thomas Brophy 01-Apr-13 07:24
Re: Ability....and transitions of time. 228 Thunderbird 01-Apr-13 23:19
Re: Ability....and transitions of time. 211 loveritas 01-Apr-13 23:53
Re: King and Queen Ascending/Descending 279 Thunderbird 02-Apr-13 20:07
Re: King and Queen Ascending/Descending 207 loveritas 02-Apr-13 22:37
Re: Bond of Heaven and Earth 254 Thunderbird 01-Apr-13 03:55
Some basics... 245 Thomas Brophy 31-Mar-13 00:16
Re: Starry Night Pro calculation still not clarified 246 Spiros 30-Mar-13 06:30
Help ask Starry Night 231 Thomas Brophy 31-Mar-13 00:58
Re: Help ask Starry Night 281 Spiros 31-Mar-13 17:58
Starry Night Pro 'fesses up to precession calculation errors 682 Thomas Brophy 02-Apr-13 19:29
Re: Starry Night Pro 'fesses up to precession calculation errors 291 Spiros 02-Apr-13 20:59
Re: Starry Night Pro 'fesses up to precession calculation errors 221 Thomas Brophy 02-Apr-13 21:22
Starry Night Pro precession calculation fix delayed 284 Thomas Brophy 10-May-13 22:39
Re: Starry Night Pro precession calculation fix delayed 245 loveritas 11-May-13 01:22
Re: Starry Night Pro precession calculation fix delayed 236 Spiros 13-May-13 22:10
What is your culminating declination? 229 Thomas Brophy 13-May-13 22:49
Re: What is your culminating declination? 222 Spiros 13-May-13 23:27
Re: What is your culminating declination? 243 Thomas Brophy 14-May-13 00:13
Re: What is your culminating declination? 190 Spiros 19-May-13 01:31
Re: I'll Rephrase the Question 310 Thomas Brophy 21-Mar-13 04:20
Einstein Not Necessary 214 loveritas 21-Mar-13 06:37
Memory & Einstein 219 loveritas 24-Mar-13 23:10
Re: Memory & Einstein 241 Thomas Brophy 24-Mar-13 23:43
Re: Zep Tepi 217 Eddie Larry 14-May-13 03:45
Re: Zep Tepi 221 Sirfiroth 15-May-13 02:15
Re: Zep Tepi 201 Eddie Larry 15-May-13 03:02


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