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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 496 loveritas 07-Mar-13 11:01
Re: Zep Tepi 317 PB Bytes 08-Mar-13 15:17
Re: Zep Tepi 309 loveritas 08-Mar-13 20:31
Mostly offline next couple of days 350 Thomas Brophy 08-Mar-13 23:57
Re: Mostly offline next couple of days 287 loveritas 09-Mar-13 00:34
Re:the waves of which dashed in powerless fury against its base. 320 Thunderbird 10-Mar-13 20:18
Nice To See You're Back 351 loveritas 12-Mar-13 04:22
Re: Nice To See You're Back 332 Thomas Brophy 16-Mar-13 04:52
GHMB 'Decorum' and Other Issues 327 Dr. Lew Graham 16-Mar-13 14:03
Re: GHMB 'Decorum' and Other Issues 322 Thomas Brophy 16-Mar-13 20:18
High on Ego 292 loveritas 16-Mar-13 21:59
and self righteous arrogance 325 Sirius7237 16-Mar-13 22:18
Re: GHMB 'Decorum' and Other Issues 356 Bobajot 17-Mar-13 02:15
Re: GHMB 'Decorum' and Other Issues 326 Aine 17-Mar-13 22:04
Relying Upon One's Discernment 368 Dr. Lew Graham 18-Mar-13 01:35
Re: Relying Upon One's Discernment 856 cladking 18-Mar-13 20:58
Atrophy of Discernment 357 Dr. Lew Graham 18-Mar-13 21:34
Re: Atrophy of Discernment 360 cladking 18-Mar-13 21:59
A Miracle? 339 Dr. Lew Graham 18-Mar-13 23:42
Accidently hit "quote" instead of post and failed to correct 346 cladking 19-Mar-13 00:20
Miracles? 306 Dr. Lew Graham 19-Mar-13 00:30
Re: A Miracle? 243 PB Bytes 19-Mar-13 00:47
Typo 342 Dr. Lew Graham 19-Mar-13 01:00
Sarcasm? 318 Sirius7237 19-Mar-13 03:04
More Hypocrisy 326 loveritas 19-Mar-13 05:32
Re: Typo 301 PB Bytes 19-Mar-13 03:26
yes, maybe thinking is not ultimate ground of being 315 Thomas Brophy 18-Mar-13 23:03
Re: yes, maybe thinking is not ultimate ground of being 327 cladking 19-Mar-13 02:16
I addressed your question on Zep Tepi, no? 318 Thomas Brophy 18-Mar-13 04:41
Re: I addressed your question on Zep Tepi, no? 327 loveritas 18-Mar-13 06:07
Re: I addressed your question on Zep Tepi, no? 396 Thomas Brophy 18-Mar-13 22:30
Re: I addressed your question on Zep Tepi, no? 362 loveritas 18-Mar-13 22:38
I'll Rephrase the Question 339 loveritas 19-Mar-13 20:42
Re: I'll Rephrase the Question 335 Aine 19-Mar-13 21:37
Re: I'll Rephrase the Question 333 loveritas 20-Mar-13 11:54
Re: I'll Rephrase the Question 346 Thomas Brophy 20-Mar-13 17:47
Re: I'll Rephrase the Question 352 Thunderbird 20-Mar-13 18:29
Re: I'll Rephrase the Question 330 loveritas 20-Mar-13 21:33
Re: I'll Rephrase the Question 321 Spiros 20-Mar-13 22:13
Re: I'll Rephrase the Question 364 Laird Scranton 21-Mar-13 16:50
Re: I'll Rephrase the Question 365 Spiros 21-Mar-13 19:16
Re: I'll Rephrase the Question 355 Audrey 24-Mar-13 04:25
Re: I'll Rephrase the Question 324 Thomas Brophy 24-Mar-13 06:10
Re: I'll Rephrase the Question 285 loveritas 24-Mar-13 06:54
Starry Night Pro calculation still not clarified 375 Thomas Brophy 29-Mar-13 22:02
Re: Starry Night Pro calculation still not clarified 344 loveritas 30-Mar-13 02:05
Re: What if?...... 309 Thunderbird 30-Mar-13 20:56
Re: What if?...... 308 loveritas 30-Mar-13 23:55
Re: Zawiyet el-Aryan meridian observation shaft/Water clock 562 Thunderbird 31-Mar-13 03:37
Re: Zawiyet el-Aryan meridian observation shaft/Water clock 340 loveritas 31-Mar-13 07:56
Bond of Heaven and Earth 501 loveritas 01-Apr-13 01:25
Djed-raising ropes? 345 Thomas Brophy 01-Apr-13 01:40
Re: Djed-raising ropes? 348 loveritas 01-Apr-13 05:18
Re: Djed-raising ropes? 325 Thomas Brophy 01-Apr-13 06:47
Re: Djed-raising ropes? 344 loveritas 01-Apr-13 06:58
Re: Djed-raising ropes? 333 Thomas Brophy 01-Apr-13 07:05
Re: Djed-raising ropes? 318 loveritas 01-Apr-13 07:11
Re: Djed-raising ropes? 348 Thomas Brophy 01-Apr-13 07:24
Re: Ability....and transitions of time. 337 Thunderbird 01-Apr-13 23:19
Re: Ability....and transitions of time. 315 loveritas 01-Apr-13 23:53
Re: King and Queen Ascending/Descending 402 Thunderbird 02-Apr-13 20:07
Re: King and Queen Ascending/Descending 304 loveritas 02-Apr-13 22:37
Re: Bond of Heaven and Earth 361 Thunderbird 01-Apr-13 03:55
Some basics... 349 Thomas Brophy 31-Mar-13 00:16
Re: Starry Night Pro calculation still not clarified 350 Spiros 30-Mar-13 06:30
Help ask Starry Night 325 Thomas Brophy 31-Mar-13 00:58
Re: Help ask Starry Night 406 Spiros 31-Mar-13 17:58
Starry Night Pro 'fesses up to precession calculation errors 932 Thomas Brophy 02-Apr-13 19:29
Re: Starry Night Pro 'fesses up to precession calculation errors 389 Spiros 02-Apr-13 20:59
Re: Starry Night Pro 'fesses up to precession calculation errors 323 Thomas Brophy 02-Apr-13 21:22
Starry Night Pro precession calculation fix delayed 397 Thomas Brophy 10-May-13 22:39
Re: Starry Night Pro precession calculation fix delayed 348 loveritas 11-May-13 01:22
Re: Starry Night Pro precession calculation fix delayed 328 Spiros 13-May-13 22:10
What is your culminating declination? 333 Thomas Brophy 13-May-13 22:49
Re: What is your culminating declination? 316 Spiros 13-May-13 23:27
Re: What is your culminating declination? 339 Thomas Brophy 14-May-13 00:13
Re: What is your culminating declination? 288 Spiros 19-May-13 01:31
Re: I'll Rephrase the Question 416 Thomas Brophy 21-Mar-13 04:20
Einstein Not Necessary 315 loveritas 21-Mar-13 06:37
Memory & Einstein 313 loveritas 24-Mar-13 23:10
Re: Memory & Einstein 362 Thomas Brophy 24-Mar-13 23:43
Re: Zep Tepi 328 Eddie Larry 14-May-13 03:45
Re: Zep Tepi 332 Sirfiroth 15-May-13 02:15
Re: Zep Tepi 293 Eddie Larry 15-May-13 03:02


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