Dial Time Corrections

Corrections need to be made in order to obtain Mean time from a sundial.  These are:

These are considered in turn below:

Equation of Time Correction - 2008
© P.Powers 2008

The figures in the table below show more accurate figures in mins and secs by which a sundial should be corrected during the current year.  The figures represent the Equation of Time at 12Hrs (Noon) GMT on the date stated and are calculated using the method after Smart.  Interpolation may be necessary if an accurate EoT is needed for other times.

Negative values in the table indicate Dial Slow.  

2008

Month Day Mins Secs Month Day Mins Secs Month Day Mins Secs
Jan 1 -3 19 May 1 2 57 Sep 1 0 7
Jan 2 -3 47 May 2 3 4 Sep 2 0 26
Jan 3 -4 15 May 3 3 10 Sep 3 0 46
Jan 4 -4 42 May 4 3 16 Sep 4 1 6
Jan 5 -5 9 May 5 3 21 Sep 5 1 26
Jan 6 -5 36 May 6 3 25 Sep 6 1 46
Jan 7 -6 2 May 7 3 29 Sep 7 2 6
Jan 8 -6 28 May 8 3 32 Sep 8 2 27
Jan 9 -6 54 May 9 3 35 Sep 9 2 48
Jan 10 -7 18 May 10 3 37 Sep 10 3 9
Jan 11 -7 43 May 11 3 39 Sep 11 3 30
Jan 12 -8 6 May 12 3 40 Sep 12 3 51
Jan 13 -8 29 May 13 3 40 Sep 13 4 12
Jan 14 -8 52 May 14 3 40 Sep 14 4 33
Jan 15 -9 13 May 15 3 39 Sep 15 4 55
Jan 16 -9 35 May 16 3 38 Sep 16 5 16
Jan 17 -9 55 May 17 3 36 Sep 17 5 38
Jan 18 -10 15 May 18 3 34 Sep 18 5 59
Jan 19 -10 34 May 19 3 31 Sep 19 6 20
Jan 20 -10 52 May 20 3 27 Sep 20 6 42
Jan 21 -11 10 May 21 3 23 Sep 21 7 3
Jan 22 -11 27 May 22 3 19 Sep 22 7 24
Jan 23 -11 43 May 23 3 14 Sep 23 7 45
Jan 24 -11 58 May 24 3 8 Sep 24 8 6
Jan 25 -12 13 May 25 3 2 Sep 25 8 27
Jan 26 -12 26 May 26 2 55 Sep 26 8 47
Jan 27 -12 39 May 27 2 48 Sep 27 9 8
Jan 28 -12 52 May 28 2 41 Sep 28 9 28
Jan 29 -13 3 May 29 2 33 Sep 29 9 48
Jan 30 -13 13 May 30 2 25 Sep 30 10 8
Jan 31 -13 23 May 31 2 16 Oct 1 10 27
Feb 1 -13 32 Jun 1 2 7 Oct 2 10 46
Feb 2 -13 40 Jun 2 1 57 Oct 3 11 5
Feb 3 -13 47 Jun 3 1 47 Oct 4