Astronomical Unit.

[Argent 88]

as·tro·nom·i·cal u·nit
/ˈˌastrəˈnäməkəl ˈyo͞onət/
nounASTRONOMY
a unit of measurement equal to 149.6 million kilometers, the mean distance from the center of the earth to the center of the sun.

It's starting to be used a lot. As a measurement in space.

For general reference, we can say that one astronomical unit (AU) represents the mean distance between the Earth and our sun. An AU is approximately 93 million miles (150 million km). It's approximately 8 light-minutes. More exactly, one astronomical unit (AU) = 92,955,807 miles (149,597,871 km).

[Argent 88]

Pete will like this one.

https://theplanets.org/distances-between-planets/

Planetary distance calculator

To calculate the distance between two planets choose one planet from the each of the dropdown options and click “Calculate” to see the results.

Calculate
 

 

Planet distance table

FROM   TO   AU   KM   MILES
Mercury   Venus   0.34   50,290,000   31,248,757
Mercury   Earth   0.61   91,691,000   56,974,146
Mercury   Mars   1.14   170,030,000   105,651,744
Mercury   Jupiter   4.82   720,420,000   447,648,234
Mercury   Saturn   9.14   1,366,690,000   849,221,795
Mercury   Uranus   18.82   2,815,640,000   1,749,638,696
Mercury   Neptune   29.70   4,443,090,000   2,760,936,126
Venus   Earth   0.28   41,400,000   25,724,767
Venus   Mars   0.8   119,740,000   74,402,987
Venus   Jupiter   4.48   670,130,000   416,399,477
Venus   Saturn   8.80   1,316,400,000   817,973,037
Venus   Uranus   18.49   2,765,350,000   1,718,388,490
Venus   Neptune   29.37   4,392,800,000   2,729,685,920
Earth   Mars   0.52   78,340,000   48,678,219
Earth   Jupiter   4.2   628,730,000   390,674,710
Earth   Saturn   8.52   1,275,000,000   792,248,270
Earth   Uranus   18.21   2,723,950,000   1,692,662,530
Earth   Neptune   29.09   4,351,400,000   2,703,959,960
Mars   Jupiter   3.68   550,390,000   342,012,346
Mars   Saturn   7.99   1,196,660,000   743,604,524
Mars   Uranus   17.69   2,645,610,000   1,643,982,054
Mars   Neptune   28.56   4,273,060,000   2,655,279,484
Jupiter   Saturn   4.32   646,270,000   401,592,178
Jupiter   Uranus   14.01   2,095,220,000   1,301,969,708
Jupiter   Neptune   24.89   3,722,670,000   2,313,267,138
Saturn   Uranus   9.7   1,448,950,000   900,377,530
Saturn   Neptune   20.57   3,076,400,000   1,911,674,960
Uranus   Neptune   10.88   1,627,450,000   1,011,297,430

[Bob Riebe]

One unit is 24.9333333333...  million miles.

[Argent 88]

One unit is 24.9333333333...  million miles.

Bob I suppose your right, but I'm going by what a couple of other sites are saying. AU would be a better system to use though in space travel. It would be better to round it off like you posted.
https://en.m.wikipedia.org/wiki/Astronomical_unit

[Argent 88]

My question is, at what time of Earths orbit around the sun was this distance calculated? It would seem like that would vary greatly.   

[Bob Riebe]

My question is, at what time of Earths orbit around the sun was this distance calculated? It would seem like that would vary greatly.

One of the reasons I loathe the metric system , other than there is no reason for it to exist, is any system based on 10 can not be divided into thirds or sixths, with out an infinite remainder.
It can only be divided into halves, fourths, fifths and tenths.
A system based on twelve can be divided into halves, thirds, fourths , fifths, sixths, eighths , tenths without a infinite remainder which when you are calculating distances of millions of miles is far, far more practical.

[Argent 88]

My question is, at what time of Earths orbit around the sun was this distance calculated? It would seem like that would vary greatly.

One of the reasons I loathe the metric system , other than there is no reason for it to exist, is any system based on 10 can not be divided into thirds or sixths, with out an infinite remainder.
It can only be divided into halves, fourths, fifths and tenths.
A system based on twelve can be divided into halves, thirds, fourths , fifths, sixths, eighths , tenths without a infinite remainder which when you are calculating distances of millions of miles is far, far more practical.

Micro meters. In machine tooling. Micrometer A micrometer (also called a micron) is 1000 times smaller than a millimeter. 1 millimeter (mm) = 1000 micrometers (μm).