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Eclipse Software EmapWin (Version 3.82)
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Emapwin simulate the solar eclipse from 13000BC to 16999AD.
(The above figure is Japanese version)
The Emapwin Eclipse simulation software has the following main features.
1) Display of the Eclipse Map
The Emapwin calculates and draws the eclipse lines on the map.
2) Display of the table of the Central line
The Emapwin makes a table indicates the northern, central and southern
limit of the umbra by the parameter of the longitude. So it is easy to
draw the line on the map.
3) Display of the Local Circumstance
The Emapwin calculate the local circumstance such as maximum magnitude,
time , altitude of the sun and direction at the given place. The Emapwin
also simulate and display the eclipse at the given place.
4) Display of the Sky at Max. Magnitude
The Emapwin display the Sky view at maximum magnitude if that point is in
the area of the total eclipse.
5) Moon Limb correction for 2nd/3rd contact time
The Emapwin calculates moon limb adjustment base on LRO/NASA satellite data.
(The above figure is Japanese version)
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The improved point of Version 3.81 from the Version 3.82
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1) The ΔT adjustment
-corrected Delta T difference between DE431 and DE441. (Only affects years before AD890)
T = T + -0.07263*year + 64.9; (AD690: 0.2sec AD1:+64.9sec, BC700: +115.7sec)
- Corrected the formula for ancient and future Delta T.
Before: delat T = -20 + 32 x ( (year-1820)/100)^2 year<-800 & year>3350
After : delat T = -10 + 31.4 x ( (year-1825)/100)^2 year<-946 & year>3538
- Corrected the formula for ancient and future Delta T.
Before: Year 2100 to 3350 ：(Values from -720 to 1820 are symmetrically inverted)-100 sec
After : Year 2100 to 3538 ：(Values from -720 to 1820 are symmetrically inverted)-81 sec
[Difference between DE431 and DE441]
(Determined from the limit of Delta T during a solar eclipse)
The Emapwin calculates based on the Bessel elements attached with the
software.The Bessel elements are for the eclipses from 13000BC to 16999AD.
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