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- Xref: sparky sci.misc:1920 sci.astro:13394 sci.geo.meteorology:3543 sci.physics:21700 alt.sci.planetary:434 sci.skeptic:21654
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- Path: sparky!uunet!mnemosyne.cs.du.edu!nyx!tlode
- From: tlode@nyx.cs.du.edu (trygve lode)
- Subject: Re: Cosmos Without Gravitation
- Message-ID: <1992Dec23.221655.7851@mnemosyne.cs.du.edu>
- Sender: usenet@mnemosyne.cs.du.edu (netnews admin account)
- Organization: Nyx, Public Access Unix @ U. of Denver Math/CS dept.
- References: <1992Dec21.195029.5158@linus.mitre.org> <1h67f4INN9ks@gap.caltech.edu>
- Date: Wed, 23 Dec 92 22:16:55 GMT
- Lines: 22
-
- In article <1h67f4INN9ks@gap.caltech.edu> carl@SOL1.GPS.CALTECH.EDU writes:
- >In article <1992Dec21.195029.5158@linus.mitre.org>, m23364@mwunix (James Meritt) writes:
- >
- >=>17. The pressure of light emanating from the sun should slowly change the orbits of the
- >=>satellites...but this change fails to materialize; a regulating force seems to overcome
- >=>this unequal light pressure on primaries and secondaries.
- >=
- >=I may be incorrect, but photonic/solar wind pressure seems several orders of magnitude
- >=for this to have an observable effect.
- >
- >Even it that weren't the case, the moron has missed an important point: Light
- >pressure on the Earth in January is equal and opposite to light pressure in
- >June. The net effect of this light pressure is to increase the diameter of the
- >Earth's orbit.
-
- One minor quibble, and one that doesn't detract from your point at all, is
- that the light pressure (and, for that matter, the solar wind) exerts a
- force on the earth that is equal and opposite in June and January, but
- this force is not entirely radial and acts to reduce the angular momentum of
- earth slightly throughout its orbit. Thus, instantaneously, the orbit is
- minutely larger than it would be without the solar radiation, but over
- time it acts to reduce the size of the orbit (also minutely).
-