The Sun is the source of all energies. These energies stimulate the activities of the houses occupied by the transiting Sun and reinforce or weaken the planetary effects, depending on the Sun's aspect to the natal planet. When the Sun transits an inner planet, it may trigger a dormant aspect between that inner planet and a slower moving outer planet. If a planet is being transited by another planet when it is being transited by the Sun, the effect of the transit is strengthened.
Sun Trine Moon
A Sun trine Moon aspect supports your partners emotional expression. Cooperation and romantic companionship flow freely as each of you gives a sense of ease and optimism to the other. When the Sun person is trine the Moon person they will find it natural to sense your feelings, take an interest in your desires and nurture your relationship as you take care of theirs. The Moon person Moon is receptive to the energy and creative self expression of the Sun person. The Sun person Sun tends to initiate action and take on the leadership role while the Moon person has a calming effect