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== References ==
{{reflist
| colwidth = 30em
| refs =
<ref name="jpl-ssd-horizons">{{cite web
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| isbn = 3-527-40556-9
}}</ref>
 
<ref name = lighttraveltime>[http://image.gsfc.nasa.gov/poetry/venus/q89.html NASA: How fast does light travel from the Sun to each of the planets?]</ref>
 
<ref name="hubblesite2007/24">