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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 466 loveritas 07-Mar-13 11:01
Re: Zep Tepi 296 PB Bytes 08-Mar-13 15:17
Re: Zep Tepi 291 loveritas 08-Mar-13 20:31
Mostly offline next couple of days 327 Thomas Brophy 08-Mar-13 23:57
Re: Mostly offline next couple of days 265 loveritas 09-Mar-13 00:34
Re:the waves of which dashed in powerless fury against its base. 304 Thunderbird 10-Mar-13 20:18
Nice To See You're Back 327 loveritas 12-Mar-13 04:22
Re: Nice To See You're Back 305 Thomas Brophy 16-Mar-13 04:52
GHMB 'Decorum' and Other Issues 301 Dr. Lew Graham 16-Mar-13 14:03
Re: GHMB 'Decorum' and Other Issues 302 Thomas Brophy 16-Mar-13 20:18
High on Ego 273 loveritas 16-Mar-13 21:59
and self righteous arrogance 306 Sirius7237 16-Mar-13 22:18
Re: GHMB 'Decorum' and Other Issues 327 Bobajot 17-Mar-13 02:15
Re: GHMB 'Decorum' and Other Issues 305 Aine 17-Mar-13 22:04
Relying Upon One's Discernment 351 Dr. Lew Graham 18-Mar-13 01:35
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? 285 Dr. Lew Graham 19-Mar-13 00:30
Re: A Miracle? 218 PB Bytes 19-Mar-13 00:47
Typo 323 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 265 loveritas 24-Mar-13 06:54
Starry Night Pro calculation still not clarified 350 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?...... 285 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 318 loveritas 31-Mar-13 07:56
Bond of Heaven and Earth 476 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? 310 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. 293 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 284 loveritas 02-Apr-13 22:37
Re: Bond of Heaven and Earth 341 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 304 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 373 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 294 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 273 Eddie Larry 15-May-13 03:02


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