Re: Age of sun and moon

Glenn Morton (GRMorton@gnn.com)
Sat, 28 Sep 1996 23:16:32

I want to say a couple of things about the recession of the moon. First, the
creationist claim that the moon would recess completely away from the earth
and be lost to the earth is wrong (see Dennis R. Peterson, Unlocking the
Mysteries of Creation, (South Lake Tahoe: Creation Resource Foundation, 1990),
p. 43). The recession of the moon is due to the tidal bulge of the earth
being carried forward of the moon by the earth's rotation. This angle causes
the moon to speed up and the earth's rotation to slow down. When the moon
becomes synchronous with the earth's rotation, no further recession will
occur. The earth and moon will circle each with the same face shining towards
each other. The earth's rotation will be one month and the moon's orbital
period will be one month (but a month will be much longer then).
This will happen when the moon is 645,000 km from the earth. (see Frank D.
Stacey, Physics of the Earth, New York: John Wiley, 1969, p. 37)

Huse states erroneously:

"The rotation of the earth is gradually slowing due to the
gravitational drag forces of the sun, moon, and other factors. If
the earth is billions of years old, as uniformitarian geologists
insist, and it has been slowing down uniformly, then its present
rotation should be zero!"~Scott M. Huse, The Collapse of Evolution,
(Grand Rapids: Baker Book House, 1983), p. 25

Which shows he does not know what he is talking about. The earth will always
have a rotation.

One can use the sedimentary structures to determine the conditions of the
earth-moon system.

"Sedimentary rhythmites of siltstone and fine sandstone from late
Precambrian (c. 650-800 Ma) glaciogenic formations in South
Australia are interpreted as distal ebb-tidal deposits that
record variability in the velocity and range of palaeo-ebb tides.
VAriations in lamina thickness encode a full spectrum of
palaeotidal cycles, including semidiurnal, diurnal, fortnightly
and monthly tidal cycles as well as the lunar apsides (perigee)
and nodal cycles. A half-yearly oscillation is attributable
largely to a beat between the fortnightly tidal cycles of luni-
solar conjuntion and lunar declination; the lunar nodal cycle is
discernible as an amplitude modulation of this beat oscillation.
The data allow determination of the Earth's palaeorotation and
the past dynamics of the Earth-Moon system with an accuracy
previously unattainable for the Precambrian. The late
Precambrian (c. 650 Ma) year contained 13.1 (+/-0.5) lunar months
and c. 400 (+/-20) days, and the late Precambrian lunar month c.
30.5 (+/-1.5) days. These value suggest an average equivalent
phase lag near 3[deg] since late Precambrian time rather than the
present value of 6[deg]. The period of 19.5 (+/-0.5) years
determined for the lunar nodal cycle c. 650 Ma ago indicates a
lunar distance 96.9 (+/- 1.7)% of the present distance. The low
rate of lunar recession since late Precambrian time revealed by
the rhythmite data militates against a close approach of the Moon
during the Proterozoic. Precambrian sedimentary rhythmites may
hold a key to the early history of the Earth's rotation."~G. E.
Williams, "Late Precambrian tidal rhythmites in South Australia
and the history of th Earth's Rotation," Journal of the
Geological Society, London, Vol. 146, 1989, p. 97.

glenn
Foundation,Fall and Flood
http://members.gnn.com/GRMorton/dmd.htm