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Posted by Peter Hayes on March 11, 2009, 5:54 pm
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For those who use or have copied my ephemeris pages I've made a small
correction so it gets daylight saving time right for those states of the
USA that use it. Most places change on the last Sunday of the month but
America decided to be different.
Pete H
http://www.aphayes.pwp.blueyonder.co.uk/ephemeris/index.html
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Posted by Paul Schlyter on March 12, 2009, 3:43 am
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>For those who use or have copied my ephemeris pages I've made a small
>correction so it gets daylight saving time right for those states of the
>USA that use it. Most places change on the last Sunday of the month but
>America decided to be different.
>Pete H
>http://www.aphayes.pwp.blueyonder.co.uk/ephemeris/index.html
Perhaps you could correct your ephemeris pages further, so that you
give RA and Decl to approximately the same accuracy? As your Javascript
ephemeris is now, you give the declination some ten times more accurate
than the accuracy of the RA you give.
Yes, I know it's a common error - people seem to fail to realize that
one minute of time (in RA) is really the same as 15 minutes of arc.
--
----------------------------------------------------------------
Paul Schlyter, Grev Turegatan 40, SE-114 38 Stockholm, SWEDEN
e-mail: pausch at stjarnhimlen dot se
WWW: http://stjarnhimlen.se/
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Posted by Peter Hayes on March 17, 2009, 3:51 pm
Please log in for more thread options Paul Schlyter wrote:
show/hide quoted text
>> For those who use or have copied my ephemeris pages I've made a small
>> correction so it gets daylight saving time right for those states of the
>> USA that use it. Most places change on the last Sunday of the month but
>> America decided to be different.
>> Pete H
>> http://www.aphayes.pwp.blueyonder.co.uk/ephemeris/index.html
>
> Perhaps you could correct your ephemeris pages further, so that you
> give RA and Decl to approximately the same accuracy? As your Javascript
> ephemeris is now, you give the declination some ten times more accurate
> than the accuracy of the RA you give.
>
> Yes, I know it's a common error - people seem to fail to realize that
> one minute of time (in RA) is really the same as 15 minutes of arc.
>
Fixed, the code now prints minutes of RA as mm.m I've also added
references to your planetary web pages for the gravitational
perturbations between the outer planets. I'm not planning to add the
corrections any time soon but a least users know of the potential errors.
Pete H
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Posted by Paul Schlyter on March 18, 2009, 4:43 am
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>Paul Schlyter wrote:
>>> For those who use or have copied my ephemeris pages I've made a small
>>> correction so it gets daylight saving time right for those states of the
>>> USA that use it. Most places change on the last Sunday of the month but
>>> America decided to be different.
>>> Pete H
>>> http://www.aphayes.pwp.blueyonder.co.uk/ephemeris/index.html
>>
>> Perhaps you could correct your ephemeris pages further, so that you
>> give RA and Decl to approximately the same accuracy? As your Javascript
>> ephemeris is now, you give the declination some ten times more accurate
>> than the accuracy of the RA you give.
>>
>> Yes, I know it's a common error - people seem to fail to realize that
>> one minute of time (in RA) is really the same as 15 minutes of arc.
>>
>Fixed, the code now prints minutes of RA as mm.m I've also added
>references to your planetary web pages for the gravitational
>perturbations between the outer planets. I'm not planning to add the
>corrections any time soon but a least users know of the potential errors.
>Pete H
Great!
But you forgot the Moon - its RA is still displayed as hh:mm
--
----------------------------------------------------------------
Paul Schlyter, Grev Turegatan 40, SE-114 38 Stockholm, SWEDEN
e-mail: pausch at stjarnhimlen dot se
WWW: http://stjarnhimlen.se/
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Posted by Peter Hayes on March 18, 2009, 5:06 pm
Please log in for more thread options Paul Schlyter wrote:
show/hide quoted text
>> Paul Schlyter wrote:
>>>> For those who use or have copied my ephemeris pages I've made a small
>>>> correction so it gets daylight saving time right for those states of the
>>>> USA that use it. Most places change on the last Sunday of the month but
>>>> America decided to be different.
>>>> Pete H
>>>> http://www.aphayes.pwp.blueyonder.co.uk/ephemeris/index.html
>>> Perhaps you could correct your ephemeris pages further, so that you
>>> give RA and Decl to approximately the same accuracy? As your Javascript
>>> ephemeris is now, you give the declination some ten times more accurate
>>> than the accuracy of the RA you give.
>>> Yes, I know it's a common error - people seem to fail to realize that
>>> one minute of time (in RA) is really the same as 15 minutes of arc.
>> Fixed, the code now prints minutes of RA as mm.m I've also added
>> references to your planetary web pages for the gravitational
>> perturbations between the outer planets. I'm not planning to add the
>> corrections any time soon but a least users know of the potential errors.
>> Pete H
>
> Great!
>
> But you forgot the Moon - its RA is still displayed as hh:mm
>
OK tomorrow, some of this code is 5 years old and I'm in the over 60
show/hide quoted text
memory failing zone ;>(
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>correction so it gets daylight saving time right for those states of the
>USA that use it. Most places change on the last Sunday of the month but
>America decided to be different.
>Pete H
>http://www.aphayes.pwp.blueyonder.co.uk/ephemeris/index.html