It's amazing that someone was able to calculate these
numbers out to 6 decimals. Is that done by some type of
observation or is it mathematics?
How could you possibly measure something like that?
On 3/25/2011 1:14 PM, Kevin Karney wrote:
Nothing is constant in the heavens !
The 'tropical'
Brent
If you measure the transit of a star (or any celestial body) through the
meridian again and again over many years with telescopes that can distinguish
less than 1 second of arc, then it's perfectly possible. Remember 1 second of
time = 15 seconds of arc. These measurements - now done
Hi:
It turns out that because of seeing you can not determine meridian
crossing to better than about 5 arc seconds (5 * 55 ms of time). (The
exception is for locations at high elevations or in space.) I've heard
that modern CCD cameras can image sections of the sky and fit the image
to a
That's still around one part in 10^8 over a year, not quite 6 decimal places of
days, but very close!
Sent from my iPhone
On Mar 26, 2011, at 11:04 AM, Brooke Clarke bro...@pacific.net wrote:
Hi:
It turns out that because of seeing you can not determine meridian crossing
to better than
People might be interested in the book
The Sun in the Church by Heilbron.
It's about using meridian lines in
cathedrals for solar measurements.
http://www.math.nus.edu.sg/aslaksen/teaching/heilbron.html
Brent
If you measure the transit of a star (or any celestial body) through the
meridian
move 58 minutes
of arc with relation to the celestial equator.
2011/3/24 Brent bren...@verizon.net
Hello again;
I read this at:
http://www.sundialsoc.org.uk/HDSW.htm
Part 17
When we look at the Sun we are observing it from a moving
platform. It is the varying speed around its elliptical
read this at:
http://www.sundialsoc.org.uk/HDSW.htm
Part 17
When we look at the Sun we are observing it from a moving
platform. It is the varying speed around its elliptical
orbit and the tilted axis which are responsible for the
daily variations accounted for by the Equation of Time.
I'm
://www.sundialsoc.org.uk/HDSW.htm
Part 17
When we look at the Sun we are observing it from a moving
platform. It is the varying speed around its elliptical
orbit and the tilted axis which are responsible for the
daily variations accounted for by the Equation of Time.
I'm confused about the varying speed part
/ssbarycenter.html
which well shows the effects of the different planetary influences on the sun’s
barycentre.
Patrick
From: Kevin Karney
Sent: Friday, March 25, 2011 8:16 PM
To: Marcelo
Cc: Sundial List
Subject: Re: varying speed?
Marcelo
Nothing is constant in the heavens
-koeln.de
*Subject:* Re: varying speed?
Marcelo
Nothing is constant in the heavens !
The 'tropical' year (from equinox to equinox) is 365.242190 days
The 'sidereal' year (fixed star to fixed star) is 365.256363 days
The 'anomalistic' year (perihelion to perihelion) is 365.259636 days -
cycling
Hello again;
I read this at:
http://www.sundialsoc.org.uk/HDSW.htm
Part 17
When we look at the Sun we are observing it from a moving
platform. It is the varying speed around its elliptical
orbit and the tilted axis which are responsible for the
daily variations accounted for by the Equation
/Kepler's_laws_of_planetary_motion
Many regards
Hank de Wit
Adelaide, Australia
-Original Message-
From: sundial-boun...@uni-koeln.de [mailto:sundial-boun...@uni-koeln.de] On
Behalf Of Brent
Sent: Friday, 25 March 2011 11:03
To: Sundial List
Subject: varying speed?
Hello again;
I read this at:
http
I meant angular momentum, not just momentum. Sorry.
-Original Message-
From: sundial-boun...@uni-koeln.de [mailto:sundial-boun...@uni-koeln.de] On
Behalf Of Hank de Wit
Sent: Friday, 25 March 2011 11:23
To: Sundial List
Subject: RE: varying speed? [SEC=UNCLASSIFIED]
Hi Brent,
Indeed
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