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Here are the Sun's declination as reported in the Nautical Almanac
versus time.  Looks pretty linear to me.  The discrepancy may lie
elsewhere, such as the system of coordinates.

When I said the time was exactly 6:48:00, I meant the calculation
indicated 6:48:00, not 6:48:01 or 6:47:59.

As both you and I said, it would be nice if an experienced astronomer
would chime in here.

Fred




On Mar 21, 2004, at 6:35 PM, Zorbec Legras wrote:

> ----- Original Message -----
> From: Gary Harkins 
> Date:         Sun, 21 Mar 2004 14:06:46 EST
>>
>> Using the Nautical Almanac and interpolating between .8' South at
>> 0600 utc
>> and .2' North at 0700 utc the equinox calculates to occur at exactly
>> 0648 utc.
>
>
> A linear interpolation between two non linear values (even from the NA
> page 63, uk release) is less accurate than a direct calculation made
> by a qualified person. Your "exactly 0648 utc" seems to be a bad joke.
> You're exactly early.
>
> The yearly Jean Meeus' sky calendar is made for astronomical
> observations conducted by astronomers.
>
> Since 1896 was the the spring equinox never so early, your are eralier
> than all spring equinoxes from 1896. But be patient, in 2008,
> (2012,2016 ... 2048) it wil be earlier than this year even earlier
> than yours.
>
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