Cool! Just wanted to give you a heads up that it's not saying what you want it to say (I took like 6 years of Latin in school like the big nerd I am instead of taking a more useful language ;p )
- "Un" should be "Unus"
- "Solis" should be "sōl" (solis would be "of the sun ")
- "ad" means "to", like "to the store". The best word to use for "upon" would be the accusative preposition "super", which would mean "terrae" should be "terram" as the direct object needs to match the case its preposition is used for.
"Unus Sol Super Terram"