Np.
It's another way to say what everyone else is saying but with a little cosmic perspective.
Looking back at it now though I realize it should say "Happy another successful
revolution of Terra about Sol." The Earth of course does rotate on it's axis as well but it revolves around the Sun to mark the passing of another year. If people were wishing you Happy Birthday every time the Earth rotated it would be every day and in short order quite wearisome for you.
Too late to edit it now as well (you only get one rotation of Terra heh)
but yeah, hope you had a great day and thank you for the
wonderful art you have done for myself and DD.