Formula to derive Time at a point on Mars

I have seen a couple of Java apps which can calculate Mars time given Earth
solar time. Is there a way to express the conversion simply enough that I
could put it into a spreadsheet.

Eg. Mars Time (at prime meridian) = f(Earth Time GMT)

A point of reference where time on Mars and Earth are known precisely is
required, but I don't have it.

A useful alternative could be to calculate the longitude of local noon on
Mars given a time on earth.

Thanks for any help
Mark

"mlm" wrote in message ...
I have seen a couple of Java apps which can calculate Mars time given Earth
solar time. Is there a way to express the conversion simply enough that I
could put it into a spreadsheet.

Eg. Mars Time (at prime meridian) = f(Earth Time GMT)

A point of reference where time on Mars and Earth are known precisely is
required, but I don't have it.

A useful alternative could be to calculate the longitude of local noon on
Mars given a time on earth.

Thanks for any help
Mark

See: http://pubs.giss.nasa.gov/abstracts/...sonMcEwen.html

"Greg Neill" wrote in newsyPSb.45576
:

http://pubs.giss.nasa.gov/abstracts/...sonMcEwen.html

Thanks Greg. It is an excellent reference (I must put on my thinking cap
though to understand it).

Mark