On Jul 31, 4:02 pm, Paz wrote:

Nope. These are still ganged to the concepts of time ON EARTH. When we
LEAVE Earth and work on an other planet, we can not keep the LOCAL
PLANET'S time with Earth concepts. A new 'day', and 'year' have to be
worked out. It's NOT a trvial question. Come to the lecture.

Still, he is _partly_ right. Or, more precisely, it is the same time
on Mars as it is on Earth plus or minus the amount of time it takes
light to travel from the Earth to Mars.

If people on Mars live underground, and use artificial lighting
instead of sunlight brought in by mirrors, then they can tell time by
Julian seconds.

Only if the Martian time of day is important to them would they need
to concern themselves with a native calendrical and horological
system, which is, of course, the topic of the lecture.

I've addressed that topic myself, on
http://www.quadibloc.com/science/cal05.htm

John Savard