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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 335 loveritas 07-Mar-13 11:01
Re: Zep Tepi 185 Poster Boy 08-Mar-13 15:17
Re: Zep Tepi 201 loveritas 08-Mar-13 20:31
Mostly offline next couple of days 205 Thomas Brophy 08-Mar-13 23:57
Re: Mostly offline next couple of days 166 loveritas 09-Mar-13 00:34
Re:the waves of which dashed in powerless fury against its base. 199 Thunderbird 10-Mar-13 20:18
Nice To See You're Back 225 loveritas 12-Mar-13 04:22
Re: Nice To See You're Back 211 Thomas Brophy 16-Mar-13 04:52
GHMB 'Decorum' and Other Issues 182 Dr. Lew Graham 16-Mar-13 14:03
Re: GHMB 'Decorum' and Other Issues 205 Thomas Brophy 16-Mar-13 20:18
High on Ego 179 loveritas 16-Mar-13 21:59
and self righteous arrogance 216 Sirius7237 16-Mar-13 22:18
Re: GHMB 'Decorum' and Other Issues 209 Bobajot 17-Mar-13 02:15
Re: GHMB 'Decorum' and Other Issues 194 Aine 17-Mar-13 22:04
Relying Upon One's Discernment 242 Dr. Lew Graham 18-Mar-13 01:35
Re: Relying Upon One's Discernment 715 cladking 18-Mar-13 20:58
Atrophy of Discernment 223 Dr. Lew Graham 18-Mar-13 21:34
Re: Atrophy of Discernment 239 cladking 18-Mar-13 21:59
A Miracle? 222 Dr. Lew Graham 18-Mar-13 23:42
Accidently hit "quote" instead of post and failed to correct 224 cladking 19-Mar-13 00:20
Miracles? 194 Dr. Lew Graham 19-Mar-13 00:30
Re: A Miracle? 133 Poster Boy 19-Mar-13 00:47
Typo 220 Dr. Lew Graham 19-Mar-13 01:00
Sarcasm? 199 Sirius7237 19-Mar-13 03:04
More Hypocrisy 205 loveritas 19-Mar-13 05:32
Re: Typo 179 Poster Boy 19-Mar-13 03:26
yes, maybe thinking is not ultimate ground of being 182 Thomas Brophy 18-Mar-13 23:03
Re: yes, maybe thinking is not ultimate ground of being 214 cladking 19-Mar-13 02:16
I addressed your question on Zep Tepi, no? 183 Thomas Brophy 18-Mar-13 04:41
Re: I addressed your question on Zep Tepi, no? 205 loveritas 18-Mar-13 06:07
Re: I addressed your question on Zep Tepi, no? 261 Thomas Brophy 18-Mar-13 22:30
Re: I addressed your question on Zep Tepi, no? 230 loveritas 18-Mar-13 22:38
I'll Rephrase the Question 218 loveritas 19-Mar-13 20:42
Re: I'll Rephrase the Question 213 Aine 19-Mar-13 21:37
Re: I'll Rephrase the Question 208 loveritas 20-Mar-13 11:54
Re: I'll Rephrase the Question 215 Thomas Brophy 20-Mar-13 17:47
Re: I'll Rephrase the Question 218 Thunderbird 20-Mar-13 18:29
Re: I'll Rephrase the Question 198 loveritas 20-Mar-13 21:33
Re: I'll Rephrase the Question 202 Spiros 20-Mar-13 22:13
Re: I'll Rephrase the Question 225 Laird Scranton 21-Mar-13 16:50
Re: I'll Rephrase the Question 244 Spiros 21-Mar-13 19:16
Re: I'll Rephrase the Question 224 Audrey 24-Mar-13 04:25
Re: I'll Rephrase the Question 197 Thomas Brophy 24-Mar-13 06:10
Re: I'll Rephrase the Question 169 loveritas 24-Mar-13 06:54
Starry Night Pro calculation still not clarified 239 Thomas Brophy 29-Mar-13 22:02
Re: Starry Night Pro calculation still not clarified 219 loveritas 30-Mar-13 02:05
Re: What if?...... 185 Thunderbird 30-Mar-13 20:56
Re: What if?...... 198 loveritas 30-Mar-13 23:55
Re: Zawiyet el-Aryan meridian observation shaft/Water clock 367 Thunderbird 31-Mar-13 03:37
Re: Zawiyet el-Aryan meridian observation shaft/Water clock 214 loveritas 31-Mar-13 07:56
Bond of Heaven and Earth 359 loveritas 01-Apr-13 01:25
Djed-raising ropes? 217 Thomas Brophy 01-Apr-13 01:40
Re: Djed-raising ropes? 222 loveritas 01-Apr-13 05:18
Re: Djed-raising ropes? 211 Thomas Brophy 01-Apr-13 06:47
Re: Djed-raising ropes? 222 loveritas 01-Apr-13 06:58
Re: Djed-raising ropes? 211 Thomas Brophy 01-Apr-13 07:05
Re: Djed-raising ropes? 196 loveritas 01-Apr-13 07:11
Re: Djed-raising ropes? 221 Thomas Brophy 01-Apr-13 07:24
Re: Ability....and transitions of time. 208 Thunderbird 01-Apr-13 23:19
Re: Ability....and transitions of time. 189 loveritas 01-Apr-13 23:53
Re: King and Queen Ascending/Descending 252 Thunderbird 02-Apr-13 20:07
Re: King and Queen Ascending/Descending 187 loveritas 02-Apr-13 22:37
Re: Bond of Heaven and Earth 230 Thunderbird 01-Apr-13 03:55
Some basics... 222 Thomas Brophy 31-Mar-13 00:16
Re: Starry Night Pro calculation still not clarified 218 Spiros 30-Mar-13 06:30
Help ask Starry Night 210 Thomas Brophy 31-Mar-13 00:58
Re: Help ask Starry Night 255 Spiros 31-Mar-13 17:58
Starry Night Pro 'fesses up to precession calculation errors 645 Thomas Brophy 02-Apr-13 19:29
Re: Starry Night Pro 'fesses up to precession calculation errors 262 Spiros 02-Apr-13 20:59
Re: Starry Night Pro 'fesses up to precession calculation errors 197 Thomas Brophy 02-Apr-13 21:22
Starry Night Pro precession calculation fix delayed 256 Thomas Brophy 10-May-13 22:39
Re: Starry Night Pro precession calculation fix delayed 223 loveritas 11-May-13 01:22
Re: Starry Night Pro precession calculation fix delayed 207 Spiros 13-May-13 22:10
What is your culminating declination? 206 Thomas Brophy 13-May-13 22:49
Re: What is your culminating declination? 204 Spiros 13-May-13 23:27
Re: What is your culminating declination? 217 Thomas Brophy 14-May-13 00:13
Re: What is your culminating declination? 169 Spiros 19-May-13 01:31
Re: I'll Rephrase the Question 272 Thomas Brophy 21-Mar-13 04:20
Einstein Not Necessary 195 loveritas 21-Mar-13 06:37
Memory & Einstein 198 loveritas 24-Mar-13 23:10
Re: Memory & Einstein 216 Thomas Brophy 24-Mar-13 23:43
Re: Zep Tepi 196 Eddie Larry 14-May-13 03:45
Re: Zep Tepi 201 Sirfiroth 15-May-13 02:15
Re: Zep Tepi 183 Eddie Larry 15-May-13 03:02


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