Re: EASTER NUT




On 3/23/08 9:48 AM, in article 3dtFj.8403$9O.6833@xxxxxxxxxxxxxxxxxxxxxx,
"Judson McClendon" <judmc@xxxxxxxxxxxxx> wrote:

"winston19842005" <bjjlyates@xxxxxxxxxxxxx> wrote:
"Judson McClendon" <judmc@xxxxxxxxxxxxx> wrote:

It is unlikely that the Gregorian Calendar will remain unchanged past year
4000 or so, because of cumulative divergence from the solar year, and by
year 4000 it will be whole day off. There have already been attempts to
correct the divergence by changing the leap year rule. The current rule is
"If year is MOD 4 then it's a leap year, unless it's MOD 100 then it isn't,
unless it's MOD 400 then it is." The new rule would add "unless it's MOD
4000 then it isn't."

Perhaps by then we will correct the REAL problem, by correcting the speed of
this planet's orbit?

Would it be preferable to make it exactly 365 days? Or maybe, let's make it
100 - easier to figure...

It's not just that the year is longer than 365.2425 days, it's that the year
is
gradually getting longer from gravitational effects like tidal friction and
orbital perturbations from Jupiter. Assuming technology to set the Earth's
orbit at exactly 365 days, it would still have to be periodically adjusted.
Setting the orbit at 100 days would require an orbit too near the sun (we
would roast) or lengthening the day to 87.6 hours. Neither sounds very
desirable, just to have an even length of year. :-) Most of the .7C increase
in global temperatures claimed over the last century is now known to be
due to a very slight increase in solar radiation during the first half of that
period. Can you imagine the drastic effects from moving the Earth closer
to the sun? :-)

The rotation of the Earth is also slowing. Have you noticed how many
leap seconds have been added in recent years? This will increase over
time. Most of this is due to tidal friction from the Moon and Sun.

I remember reading that the drag effect was slowing down our movement around
the Sun.

Yes, I realize the effect of 100 day orbit! ;)

I remember an old BASIC that allowed you to pick a star or pick a star type,
then you were allowed to pick the particulars of your planet and it would
tell you the probability of life and other particulars.

I think it was called "World Builder". Still have it on an old TI 5.25"
floppy. Do you remember that? I cannot remember where it came from. Maybe
TRS-80, since my friend who translated it was heavily into those. Google
comes up with way too many hits...

I'm sure if you looked at it closely today, you could pick its "science"
apart, but it was fun at the time!

.

Relevant Pages

  • Re: EASTER NUT
    ... 4000 or so, because of cumulative divergence from the solar year, and by ... orbit at exactly 365 days, it would still have to be periodically adjusted. ... Setting the orbit at 100 days would require an orbit too near the sun (we ...
    (comp.lang.basic.misc)
  • Re: EASTER NUT
    ... 4000 or so, because of cumulative divergence from the solar year, and by ... orbit at exactly 365 days, it would still have to be periodically adjusted. ... Setting the orbit at 100 days would require an orbit too near the sun (we ...
    (comp.lang.basic.misc)
  • Re: Good Article on Orbital Dynamics
    ... it's sun, where the temperature is just right for liquid water to ... the Sun is too magnificent a motion to ignore.yet  you have no feel ... the course of an annual orbit. ... one year period, due to the motion of the earth, but this is not the 360 ...
    (sci.astro)
  • Re: Good Article on Orbital Dynamics
    ... configuration of extrasolar planets aroung the star 55 Cancri ... central Sun is 100 % certain along with the nature of the change ... principle to the Earth's orbital motion leads to a simple working ... respect to the Sun over the course of an annual orbit. ...
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  • Dawn Journal - September 27, 2009
    ... Dawn Journal ... propulsion system to gradually modify its orbit around the Sun. ... The thrusting so far in the mission has achieved the equivalent of ...
    (sci.space.news)
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