The Sun

Astrological Counterpart: The Sun, the revelator, the symbol of vitality, identity, success and triumph;
Mythological Correspondent: the Solar deities, Ra, Helios, Sol and the Forces of Light or the reconciliation between Gilgamesh and Enkidu or Feirefiz and Percival;
Cabalistic Counterpart: Resh;
I Ching Correspondent: 24 Fu/Return (The Turning Point).

General
The Sun represents success, vitality and self-expression. The child riding the horse is a metaphor for your childhood or any other period in your life when you felt absolutely free and completely happy. There's no saddle on the horse and the child uses neither one of his hands to control the animal, an image suggesting that a balance has been stricken between the conscious and subconscious. The banner he holds is meant to be an allusion to vitality and good health. It goes without saying that this card is widely perceived as a very favourable one, a harbinger of fulfillment and recognition.

Work: If you're looking for a job, this card shows that you're likely to find what you're looking for. But don't forget to keep your ego under control. Acknowledge other people's contribution to your accomplishments and stay modest. On the whole, you're on the right track.

Love: Now isn't the right moment to be clingy or needy. Respect his/her privacy and freedom. If you're single and looking, love's on the horizon. But steer clear from being a try-hard. Act naturally and you won't have to fake your way into a relationship. Strive to stay authentic.

When Mercury is retrograde, focus on the activities that have "re" attached to the beginning of the word, such as reanalyzing information and ideas, revising contracts, revisiting old friends etc. You can consult the Planetary Retrograde Calendar here.