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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 404 loveritas 07-Mar-13 11:01
Re: Zep Tepi 249 PB Bytes 08-Mar-13 15:17
Re: Zep Tepi 248 loveritas 08-Mar-13 20:31
Mostly offline next couple of days 283 Thomas Brophy 08-Mar-13 23:57
Re: Mostly offline next couple of days 228 loveritas 09-Mar-13 00:34
Re:the waves of which dashed in powerless fury against its base. 262 Thunderbird 10-Mar-13 20:18
Nice To See You're Back 280 loveritas 12-Mar-13 04:22
Re: Nice To See You're Back 263 Thomas Brophy 16-Mar-13 04:52
GHMB 'Decorum' and Other Issues 254 Dr. Lew Graham 16-Mar-13 14:03
Re: GHMB 'Decorum' and Other Issues 258 Thomas Brophy 16-Mar-13 20:18
High on Ego 229 loveritas 16-Mar-13 21:59
and self righteous arrogance 264 Sirius7237 16-Mar-13 22:18
Re: GHMB 'Decorum' and Other Issues 275 Bobajot 17-Mar-13 02:15
Re: GHMB 'Decorum' and Other Issues 260 Aine 17-Mar-13 22:04
Relying Upon One's Discernment 308 Dr. Lew Graham 18-Mar-13 01:35
Re: Relying Upon One's Discernment 773 cladking 18-Mar-13 20:58
Atrophy of Discernment 304 Dr. Lew Graham 18-Mar-13 21:34
Re: Atrophy of Discernment 297 cladking 18-Mar-13 21:59
A Miracle? 284 Dr. Lew Graham 18-Mar-13 23:42
Accidently hit "quote" instead of post and failed to correct 281 cladking 19-Mar-13 00:20
Miracles? 246 Dr. Lew Graham 19-Mar-13 00:30
Re: A Miracle? 178 PB Bytes 19-Mar-13 00:47
Typo 281 Dr. Lew Graham 19-Mar-13 01:00
Sarcasm? 254 Sirius7237 19-Mar-13 03:04
More Hypocrisy 259 loveritas 19-Mar-13 05:32
Re: Typo 238 PB Bytes 19-Mar-13 03:26
yes, maybe thinking is not ultimate ground of being 246 Thomas Brophy 18-Mar-13 23:03
Re: yes, maybe thinking is not ultimate ground of being 262 cladking 19-Mar-13 02:16
I addressed your question on Zep Tepi, no? 251 Thomas Brophy 18-Mar-13 04:41
Re: I addressed your question on Zep Tepi, no? 268 loveritas 18-Mar-13 06:07
Re: I addressed your question on Zep Tepi, no? 319 Thomas Brophy 18-Mar-13 22:30
Re: I addressed your question on Zep Tepi, no? 295 loveritas 18-Mar-13 22:38
I'll Rephrase the Question 274 loveritas 19-Mar-13 20:42
Re: I'll Rephrase the Question 268 Aine 19-Mar-13 21:37
Re: I'll Rephrase the Question 268 loveritas 20-Mar-13 11:54
Re: I'll Rephrase the Question 273 Thomas Brophy 20-Mar-13 17:47
Re: I'll Rephrase the Question 285 Thunderbird 20-Mar-13 18:29
Re: I'll Rephrase the Question 267 loveritas 20-Mar-13 21:33
Re: I'll Rephrase the Question 260 Spiros 20-Mar-13 22:13
Re: I'll Rephrase the Question 297 Laird Scranton 21-Mar-13 16:50
Re: I'll Rephrase the Question 301 Spiros 21-Mar-13 19:16
Re: I'll Rephrase the Question 289 Audrey 24-Mar-13 04:25
Re: I'll Rephrase the Question 261 Thomas Brophy 24-Mar-13 06:10
Re: I'll Rephrase the Question 221 loveritas 24-Mar-13 06:54
Starry Night Pro calculation still not clarified 303 Thomas Brophy 29-Mar-13 22:02
Re: Starry Night Pro calculation still not clarified 278 loveritas 30-Mar-13 02:05
Re: What if?...... 242 Thunderbird 30-Mar-13 20:56
Re: What if?...... 245 loveritas 30-Mar-13 23:55
Re: Zawiyet el-Aryan meridian observation shaft/Water clock 471 Thunderbird 31-Mar-13 03:37
Re: Zawiyet el-Aryan meridian observation shaft/Water clock 268 loveritas 31-Mar-13 07:56
Bond of Heaven and Earth 413 loveritas 01-Apr-13 01:25
Djed-raising ropes? 273 Thomas Brophy 01-Apr-13 01:40
Re: Djed-raising ropes? 285 loveritas 01-Apr-13 05:18
Re: Djed-raising ropes? 257 Thomas Brophy 01-Apr-13 06:47
Re: Djed-raising ropes? 286 loveritas 01-Apr-13 06:58
Re: Djed-raising ropes? 265 Thomas Brophy 01-Apr-13 07:05
Re: Djed-raising ropes? 253 loveritas 01-Apr-13 07:11
Re: Djed-raising ropes? 276 Thomas Brophy 01-Apr-13 07:24
Re: Ability....and transitions of time. 271 Thunderbird 01-Apr-13 23:19
Re: Ability....and transitions of time. 246 loveritas 01-Apr-13 23:53
Re: King and Queen Ascending/Descending 326 Thunderbird 02-Apr-13 20:07
Re: King and Queen Ascending/Descending 238 loveritas 02-Apr-13 22:37
Re: Bond of Heaven and Earth 288 Thunderbird 01-Apr-13 03:55
Some basics... 282 Thomas Brophy 31-Mar-13 00:16
Re: Starry Night Pro calculation still not clarified 283 Spiros 30-Mar-13 06:30
Help ask Starry Night 261 Thomas Brophy 31-Mar-13 00:58
Re: Help ask Starry Night 334 Spiros 31-Mar-13 17:58
Starry Night Pro 'fesses up to precession calculation errors 770 Thomas Brophy 02-Apr-13 19:29
Re: Starry Night Pro 'fesses up to precession calculation errors 320 Spiros 02-Apr-13 20:59
Re: Starry Night Pro 'fesses up to precession calculation errors 256 Thomas Brophy 02-Apr-13 21:22
Starry Night Pro precession calculation fix delayed 323 Thomas Brophy 10-May-13 22:39
Re: Starry Night Pro precession calculation fix delayed 287 loveritas 11-May-13 01:22
Re: Starry Night Pro precession calculation fix delayed 268 Spiros 13-May-13 22:10
What is your culminating declination? 268 Thomas Brophy 13-May-13 22:49
Re: What is your culminating declination? 249 Spiros 13-May-13 23:27
Re: What is your culminating declination? 270 Thomas Brophy 14-May-13 00:13
Re: What is your culminating declination? 213 Spiros 19-May-13 01:31
Re: I'll Rephrase the Question 348 Thomas Brophy 21-Mar-13 04:20
Einstein Not Necessary 249 loveritas 21-Mar-13 06:37
Memory & Einstein 252 loveritas 24-Mar-13 23:10
Re: Memory & Einstein 286 Thomas Brophy 24-Mar-13 23:43
Re: Zep Tepi 258 Eddie Larry 14-May-13 03:45
Re: Zep Tepi 267 Sirfiroth 15-May-13 02:15
Re: Zep Tepi 234 Eddie Larry 15-May-13 03:02


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