| THE EQUATION OF TIME ~ E O T |
| This is a PDF file that discusses why the sun appears slow or fast, the two major components, how they are each sine waves that make a curve allowing the real sun apparent time to be synchronized with mean time or clock time. It is an extract from the main book ILLUSTRATING TIME'S SHADOW This file is about 150k and is virus free - checked by the latest Norton as well as PCcillin. CLICK HERE TO DOWNLOAD the explanatory document - around 120k and supplement 1 by itself on an astronomically accurate EOT dissertation. Having been asked to explain the EOT, here it is! Extracted from the book which I hope you will buy! The pamphlet and the spreadsheet (which is invoked by the main sheet here) have the astronomical formulae needed to develop the EOT table for any year, from way back when to the future, and to show the low and high peaks in the EOT, and to show the julian days of the solstices and equinoxes for that year. The pamphlet shows those formulae in Excel ready format, and the actual spreadsheet has a few interesting goodies in it also. |
| Astronomical EOT and solstice and equinox information and spreadsheet:- EOT 2004 EOT 2005 EOT 2006 EOT 2007 EOT 1904 EOT 2104 Explanatory article A good web site for the EOT and analemma Complete EOT spreadsheet with all formulae which is invoked by this main spreadsheet *** NOTE *** always download then use a spreadsheet, never run it online without downloading. *** NOTE *** an EOT sheet incorporates EOT and longitude, to generate a table to correct dials designed with no longitude correction built in. Excel version is here, and the Open Office version is here. This is also in the main spreadsheets. These however have an EOT graph to show the total EOT correction. |
| 2010 |
| For general purposes, the tables rotate every four years Also, note that almanacs exist in Euler, Scilab, DeltaCAD as well as for the Palm Pilot as a standalone application. DeltaCAD almanacs depict EOT graphically or as tables. This analemma page discusses the dial plate furniture to depict the EOT, known as the analemma, and has notes on analemma construction and issues as well. |
5th 15th 25th
JAN 5.1 9.0 12.0
FEB 13.9 14.2 13.4
MAR 11.9 9.3 6.3
APR 2.8 0.0 -2.3
MAY -3.6 -4.0 -3.5
JUN -2.0 -0.1 2.0
JLY 3.9 5.3 5.9
AUG 5.4 3.8 1.4
SEP -2.2 -5.8 -9.4
OCT -12.7 -15.1 -16.5
NOV -16.5 -15.1 -12.5
DEC -8.8 -4.5 0.2
JAN 5.1 9.0 12.0
FEB 13.9 14.2 13.4
MAR 11.9 9.3 6.3
APR 2.8 0.0 -2.3
MAY -3.6 -4.0 -3.5
JUN -2.0 -0.1 2.0
JLY 3.9 5.3 5.9
AUG 5.4 3.8 1.4
SEP -2.2 -5.8 -9.4
OCT -12.7 -15.1 -16.5
NOV -16.5 -15.1 -12.5
DEC -8.8 -4.5 0.2
| A helpful EOT table for the 5th, 15th, and 25th of each month, for a generic year. |
An EOT table using copper wire, copper
tube (1/4 inch), and a glass backing.
Sun slow (+ve EOT) on top, sun fast
(EOT -ve) on bottom. And the 12 months
are displayed horizontally. The time
scale is 5, 10, and 15 minutes.
tube (1/4 inch), and a glass backing.
Sun slow (+ve EOT) on top, sun fast
(EOT -ve) on bottom. And the 12 months
are displayed horizontally. The time
scale is 5, 10, and 15 minutes.