No Violations. Laws Stay. - an Astronomy Net Blackholes Forum Message

Blackholes Forum Message
Forums:	Atm · Astrophotography · Blackholes · Blackholes2 · CCD · Celestron · Domes · Education Eyepieces · Meade · Misc. · God and Science · SETI · Software · UFO · XEphem


Home \| Discussion Forums \| Blackholes I \| Post	Login

Be the first pioneers to continue the Astronomy Discussions at our new Astronomy meeting place...
The Space and Astronomy Agora

No Violations. Laws Stay.

Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To
Posted by Alexander on March 12, 2001 14:47:21 UTC

Earth and Moon are interacting gravitationally slightly non-centrally because Earth is not spherical - there are 2 tidal bulges on Earth - one due to Moon's pull and the opposite one due to centripetal accelearation of Earth orbiting center of mass of Earth-Moon system.

Due to Earth's rotation they are not exactly under Moon-Earth line, but are slightly ahead (inertia). So near bulge pulls Moon forward about 6.7% stronger than farther bulge pulls it back (becase the farther one is farther away). Thus Moon accelerates forward and gains angular momentum and Earth slows down (so total momentum remains the same).

As a result each Earth's day is 42 nanosecond longer than the previous one and Moon is receeding about 1.5 inches/year away from Earth.

Follow Ups:

newton and einstein-laws - libbie468 - March 12, 2001 - 21:21 UTC
- GR - bruce - March 15, 2001 - 20:45 UTC
  - what is the origin of curved space? - alexander - March 19, 2001 - 17:54 UTC
    - curved space theory - richardlewis - June 5, 2001 - 08:20 UTC

Additional Information

About Astronomy Net | Advertise on Astronomy Net | Contact & Comments | Privacy Policy

Unless otherwise specified, web site content Copyright 1994-2024 John Huggins All Rights Reserved
Forum posts are Copyright their authors as specified in the heading above the post.
"dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET"
are trademarks of John Huggins