The Moon Age Calendar ... DrawUp 1998/04/07 .. Renovate 1998/07/20

The position computation by the moon and the sun

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Use Netscape Navigator 3.x (or higher) and Internet Explorer 4.0.
In Internet Explorer 3.0, the error occurs.
[The reading sometimes takes time because the Script size is big.]

It is possible to calculate from the optional date and time.
It is from A.D 1580 to A.D 2030 that the computation precision is high.







GMT difference
. . . . .
In the case of the wish to continue to store up and to compute, specify the date and time after clearing.
The picture display by the moon sometimes hangs over load for several seconds.

Julian day
age of moon

moon face

moon phase angle

ratio of illuminated side


The Moon
ecliptic longitude

ecliptic latitude

geocentric distance

ratio of the average


The sun
ecliptic longitude

geocentric distance

ratio of the average


As for the real time computation, look at

There is an error from the trick of the computation precision of the Java Script double-precision fluctuation point and the precision with trigonometrical function but it is the degree which is not in the problem in case of practical use.

It reduced an attempt size to about 30 % in the efficient-ization of the program.
Because it is easy, it will be better not to see a source code. :-)

When the high computation result of the precision is necessary, use Windows95/NT exclusive use soft ware "Moon32.exe".
The Windows system is a download in the page of SoftWare in freeware "Moon##.exe" and comes.

We provide to transplant as the Mac edition of Windows95/NT exclusive use freeware "Moon32.exe" a source code and a data.