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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 317 loveritas 07-Mar-13 11:01
Re: Zep Tepi 173 Poster Boy 08-Mar-13 15:17
Re: Zep Tepi 195 loveritas 08-Mar-13 20:31
Mostly offline next couple of days 195 Thomas Brophy 08-Mar-13 23:57
Re: Mostly offline next couple of days 159 loveritas 09-Mar-13 00:34
Re:the waves of which dashed in powerless fury against its base. 191 Thunderbird 10-Mar-13 20:18
Nice To See You're Back 213 loveritas 12-Mar-13 04:22
Re: Nice To See You're Back 198 Thomas Brophy 16-Mar-13 04:52
GHMB 'Decorum' and Other Issues 174 Dr. Lew Graham 16-Mar-13 14:03
Re: GHMB 'Decorum' and Other Issues 194 Thomas Brophy 16-Mar-13 20:18
High on Ego 171 loveritas 16-Mar-13 21:59
and self righteous arrogance 208 Sirius7237 16-Mar-13 22:18
Re: GHMB 'Decorum' and Other Issues 193 Bobajot 17-Mar-13 02:15
Re: GHMB 'Decorum' and Other Issues 185 Aine 17-Mar-13 22:04
Relying Upon One's Discernment 231 Dr. Lew Graham 18-Mar-13 01:35
Re: Relying Upon One's Discernment 706 cladking 18-Mar-13 20:58
Atrophy of Discernment 209 Dr. Lew Graham 18-Mar-13 21:34
Re: Atrophy of Discernment 231 cladking 18-Mar-13 21:59
A Miracle? 215 Dr. Lew Graham 18-Mar-13 23:42
Accidently hit "quote" instead of post and failed to correct 211 cladking 19-Mar-13 00:20
Miracles? 186 Dr. Lew Graham 19-Mar-13 00:30
Re: A Miracle? 125 Poster Boy 19-Mar-13 00:47
Typo 210 Dr. Lew Graham 19-Mar-13 01:00
Sarcasm? 189 Sirius7237 19-Mar-13 03:04
More Hypocrisy 196 loveritas 19-Mar-13 05:32
Re: Typo 171 Poster Boy 19-Mar-13 03:26
yes, maybe thinking is not ultimate ground of being 174 Thomas Brophy 18-Mar-13 23:03
Re: yes, maybe thinking is not ultimate ground of being 207 cladking 19-Mar-13 02:16
I addressed your question on Zep Tepi, no? 173 Thomas Brophy 18-Mar-13 04:41
Re: I addressed your question on Zep Tepi, no? 197 loveritas 18-Mar-13 06:07
Re: I addressed your question on Zep Tepi, no? 245 Thomas Brophy 18-Mar-13 22:30
Re: I addressed your question on Zep Tepi, no? 215 loveritas 18-Mar-13 22:38
I'll Rephrase the Question 210 loveritas 19-Mar-13 20:42
Re: I'll Rephrase the Question 206 Aine 19-Mar-13 21:37
Re: I'll Rephrase the Question 201 loveritas 20-Mar-13 11:54
Re: I'll Rephrase the Question 207 Thomas Brophy 20-Mar-13 17:47
Re: I'll Rephrase the Question 205 Thunderbird 20-Mar-13 18:29
Re: I'll Rephrase the Question 188 loveritas 20-Mar-13 21:33
Re: I'll Rephrase the Question 192 Spiros 20-Mar-13 22:13
Re: I'll Rephrase the Question 216 Laird Scranton 21-Mar-13 16:50
Re: I'll Rephrase the Question 234 Spiros 21-Mar-13 19:16
Re: I'll Rephrase the Question 212 Audrey 24-Mar-13 04:25
Re: I'll Rephrase the Question 187 Thomas Brophy 24-Mar-13 06:10
Re: I'll Rephrase the Question 160 loveritas 24-Mar-13 06:54
Starry Night Pro calculation still not clarified 230 Thomas Brophy 29-Mar-13 22:02
Re: Starry Night Pro calculation still not clarified 207 loveritas 30-Mar-13 02:05
Re: What if?...... 176 Thunderbird 30-Mar-13 20:56
Re: What if?...... 191 loveritas 30-Mar-13 23:55
Re: Zawiyet el-Aryan meridian observation shaft/Water clock 343 Thunderbird 31-Mar-13 03:37
Re: Zawiyet el-Aryan meridian observation shaft/Water clock 206 loveritas 31-Mar-13 07:56
Bond of Heaven and Earth 343 loveritas 01-Apr-13 01:25
Djed-raising ropes? 207 Thomas Brophy 01-Apr-13 01:40
Re: Djed-raising ropes? 212 loveritas 01-Apr-13 05:18
Re: Djed-raising ropes? 204 Thomas Brophy 01-Apr-13 06:47
Re: Djed-raising ropes? 212 loveritas 01-Apr-13 06:58
Re: Djed-raising ropes? 204 Thomas Brophy 01-Apr-13 07:05
Re: Djed-raising ropes? 187 loveritas 01-Apr-13 07:11
Re: Djed-raising ropes? 210 Thomas Brophy 01-Apr-13 07:24
Re: Ability....and transitions of time. 200 Thunderbird 01-Apr-13 23:19
Re: Ability....and transitions of time. 181 loveritas 01-Apr-13 23:53
Re: King and Queen Ascending/Descending 245 Thunderbird 02-Apr-13 20:07
Re: King and Queen Ascending/Descending 180 loveritas 02-Apr-13 22:37
Re: Bond of Heaven and Earth 222 Thunderbird 01-Apr-13 03:55
Some basics... 211 Thomas Brophy 31-Mar-13 00:16
Re: Starry Night Pro calculation still not clarified 203 Spiros 30-Mar-13 06:30
Help ask Starry Night 202 Thomas Brophy 31-Mar-13 00:58
Re: Help ask Starry Night 240 Spiros 31-Mar-13 17:58
Starry Night Pro 'fesses up to precession calculation errors 621 Thomas Brophy 02-Apr-13 19:29
Re: Starry Night Pro 'fesses up to precession calculation errors 252 Spiros 02-Apr-13 20:59
Re: Starry Night Pro 'fesses up to precession calculation errors 191 Thomas Brophy 02-Apr-13 21:22
Starry Night Pro precession calculation fix delayed 246 Thomas Brophy 10-May-13 22:39
Re: Starry Night Pro precession calculation fix delayed 215 loveritas 11-May-13 01:22
Re: Starry Night Pro precession calculation fix delayed 201 Spiros 13-May-13 22:10
What is your culminating declination? 197 Thomas Brophy 13-May-13 22:49
Re: What is your culminating declination? 197 Spiros 13-May-13 23:27
Re: What is your culminating declination? 204 Thomas Brophy 14-May-13 00:13
Re: What is your culminating declination? 163 Spiros 19-May-13 01:31
Re: I'll Rephrase the Question 258 Thomas Brophy 21-Mar-13 04:20
Einstein Not Necessary 187 loveritas 21-Mar-13 06:37
Memory & Einstein 189 loveritas 24-Mar-13 23:10
Re: Memory & Einstein 207 Thomas Brophy 24-Mar-13 23:43
Re: Zep Tepi 188 Eddie Larry 14-May-13 03:45
Re: Zep Tepi 193 Sirfiroth 15-May-13 02:15
Re: Zep Tepi 176 Eddie Larry 15-May-13 03:02


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