Here's why:
* "Tu Tomas" is grammatically wrong. In Spanish, you would say "Tú, Tomás" (You, Thomas) to address someone named Tomás directly.
* "es sol" means "is sun," which doesn't make sense in this context.
It's likely that the intended meaning was something like:
* "Tú eres el sol" - You are the sun (meaning someone is bright, cheerful, or the center of attention).
* "Tomás es el sol" - Tomás is the sun (meaning Tomás is bright, cheerful, or the center of attention).
Without more context, it's impossible to know for sure what the intended meaning was.