Hi,
About transits - I like the bit in the film Longitude (if I
remember it correctly) were Harrison's son is asked by some worthy
how they get a local time check. The young lad points to the
chimney on a certain house and says that they wait for a
particular star to disappear behind it.
I'm interested in automatically measuring the earth's period by looking
close to straight up with a fixed telescope.
Here's a related idea for you; a modern digital sundial.
Two different ways to implement it:
1) Aim a webcam on a standard sundial and write some
image processing software that
Hi Tom:
With an atomic quality clock it should be possible to measure the period
of the earth every day using the sun and/or stars and see how far from
86400 seconds it is.
I too have been thinking of how to use the sun in a precision way.
Since UTC is close (UTC1 is better) to the sun's
Tom Van Baak wrote,
2) Instead of a fixed base, gnomon, and slowly moving shadow like
almost all sundials, you put a stepper or servo motor/encoder on the
base. Then place matched photodiodes on either side of the gnomon and
steer the whole sundial for constant *minimum* shadow. In real-time, a
I have been lurking in the background for quite some time now, very
interested in what is going on. Now I have a reason to post ;-)
I have recently acquired an HP 105 B crystal oscillator and am looking
for a manual for the thing, can anyone help?
Regards
Dave Armstrong
begin:vcard
fn:David
David Armstrong wrote:
I have been lurking in the background for quite some time now, very
interested in what is going on. Now I have a reason to post ;-)
I have recently acquired an HP 105 B crystal oscillator and am looking
for a manual for the thing, can anyone help?
Regards
Dave
I wrote,
The scheme probably needs three photocells to be sure that
the one in the middle is darker than the others. Might be
able to mask it with a slit and use a fine wire gnomon, in
a coarse/fine servo. Could use a variable frequency motor
and precision reduction, like a phonograph turntable
Does anyone out there have access to decent scanning equipment?
What does Kinkos (or equivalent) charge? (mostly curious)
--
The suespammers.org mail server is located in California. So are all my
other mailboxes. Please do not send unsolicited bulk e-mail or unsolicited
commercial e-mail
Kinko's has a little problem with any document that has a copyright. Seems
that they don't want to be sued.
Been there, done that, had the argument.
Norm n3ykf
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Dr Bruce Griffiths wrote:
David Forbes wrote:
Bill Hawkins wrote:
Tom Van Baak wrote,
2) Instead of a fixed base, gnomon, and slowly moving shadow like
almost all sundials, you put a stepper or servo motor/encoder on the
base. Then place matched photodiodes on either side of
The scheme probably needs three photocells to be sure that the one
in the middle is darker than the others. Might be able to mask it
with a slit and use a fine wire gnomon, in a coarse/fine servo.
Could use a variable frequency motor and precision reduction, like
a phonograph turntable only
It isn't really a problem. If you take off the page that says copyright,
they will copy them for you.
Norman J McSweyn wrote:
Kinko's has a little problem with any document that has a copyright. Seems
that they don't want to be sued.
Been there, done that, had the argument.
Norm n3ykf
It was only a matter of time before google led a curious
reporter to our mailing list. Let me know if this shows
up in your local newspaper in the next few weeks...
http://www.newhousenews.com/archive/sefton092706.html
/tvb
http://www.LeapSecond.com
Tom Van Baak wrote:
The scheme probably needs three photocells to be sure that the one
in the middle is darker than the others. Might be able to mask it
with a slit and use a fine wire gnomon, in a coarse/fine servo.
Could use a variable frequency motor and precision reduction, like
a
hey i like the garbage day ending for the 7nanoseconds off reason !!! looks
like he has all the good stuff just on the shelf. hey how about spreading
some of those good clocks around so we can be closer than 7 nanoseconds. my
rubidum is tracking 60kc wwv for days and takes a lot of paper to
You make us proud, Tom. :-)
John
Tom Van Baak said the following on 09/28/2006 08:06 PM:
It was only a matter of time before google led a curious
reporter to our mailing list. Let me know if this shows
up in your local newspaper in the next few weeks...
Let's hope that news article doesn't turn out to be the
equivalent of AOL introducing their members to newsnet
in the early 90s. The leader of one fine science list
closed it down because there was so much new chatter
and no new knowledge.
Regards,
Bill Hawkins
P.S. How about using a mirror
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