Sue Worden wrote:
>
> Jim Cook wrote:
> > Unfortunately, I'm all thumbs with UTC conversions.
Seems pretty simple. Just 'X' number of hours between you and UTC.
That is always the same, except for daylight time.
> Much harder for me to keep straight is the day.fraction format,
> since months have varying numbers of days.
I don't understand. The fraction of a day is constant no matter how many days
there are in a month. They are completely independent of each other. You usually
don't need the exact conversion. Roughly, .1 would be 2.4 hours. .25 (1/4 day)
is 6 hours.
.5 is 12 hours.
>A "trick" I've used
> for that is to mark up my calendar at the beginning of each year.
> At the top of January goes a "0"; at the top of February goes a
> "31"; at the top of March goes either a "59" or "60". You get
> the idea. The "day" value is then the date in the month plus
> the number at the top of the month, e.g., February 17 is day
> 17+31.
Ok, here we're talking about day #. I have a little chart that shows # of each
day of year. I can post it on my Sky Views web site (below) if there's enough
interest. Mailed photo copies can be arranged too.
There's something else that I use though. A friend here in Freehold owns a
Stewart Title Insurance company. She has small desk and large wall calendars
each year with the day #, counting from the first and last day of the year,
printed near each date. They are really very handy. As they are a national
company, see if an office serving your area would give you one. For those who
can't get them locally, I could check what they would cost to buy. Let me know
by Nov. if you want some.
> Surely people has already written programs to convert from the
> day.fraction format to the month:day:hour:minute:second format
> for local time zones...? If not, I'll write one.
Not the month/day, but for fraction of day to H,M,S. There was a 2 page table in
American Ephemeris 1960. I'm sure it's in other years too. I guess copies can
also be posted on my web site or mailed.
--
Jay Respler
--
JRespler@superlink.net
SKY VIEWS: http://mars.superlink.net/jrespler/skyviews.htm
Satellite Tracker * Early Typewriter Collector
Freehold, New Jersey
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