Examples:
For New York e.g. must below next be entered
at longitude degree 74 and with the minutes 0 !
New York (US) is west (w) of Greenwich
Having a clock thus set to the sun requires,
if you want to keep it within a margin of a couple of minutes,
that you correct the time so about once a week,
Not doing this can the difference quickly amount
to half an hour (from Nov. 5 to Febr. 5 e.g.).
Correcting for the sake of nature
can best be done with natural regularity:
on Cakra-sundays e.g., follow links below:
To check this by hand you need to consult
the pages about
the equation of time
and the FCO-calendar
*: GMT: Greenwich
Mean Time -
the time standard for the entire world.
It is mean local time to the longitude of zero irrespective
summertime.
It is also called UTC (Universal Time Coordinated) or worldtime.
The time on your clock differs from this one
depending your time zone and summertime.