Introducing 1 AAU (Areal Astronomical Unit) for the area of a circle of radius 1 AU, how do you find 4-sd values in AAU, fot the orbital areas of solar planets?

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Answer 1 · 2016-10-05T04:34:56

Mercury:.1498 AAU Venus: .5232 AAU Earth 1 AAU
Mars: 2.320 AAU Jupiter: 27.09 AAU Saturn: 91.81 AAU
Uranus: 368.6 AAU Neptune: 903.0 AAU.

The orbital areas in AAU are

Mercury:0.1498 AAU

Venus: 0.5232 AAU

Earth 1 AAU

Mars: 2.320 AAU

Jupiter: 27.09 AAU

Saturn: 91.81 AAU

Uranus: 368.6 AAU

Neptune: 903.0 AAU.

A MON AVIS: Using AAU as areal unit, we get the direct

comparison with the area for the Earth orbit which is nearly

#1 A AU#

#=pi AU^2=70307# trillion sq. km, nearly.

The formula for conversion is

#1 AU= sqrt(1/pi A AU)=0.5642sqrt(A AU)#

Cross check: #1 AU = 0.5642sqrt(70307 X 10^12)=1.496 X 10^8 km#

I also extend this definition for volume of a unit sphere as SAU:

1 SAU

= volume of a sphere of radius 1 AU

#= 4/3pi AU^3#.

For length, this unit is LAU.

1 LAU

= circumference of a circle of radius 1 AU

# = 2 pi AU#

= 939,951,145 km, nearly.