A weak Sun is evidenced by the Sun being in its debility (Libra), or in an inimical sign (like those of Saturn), in difficult houses (like the sixth, eight, twelfth) or under malefic aspect (like those of Saturn, Rahu or Ketu). Ketu’s aspect or close conjunction is particularly difficult.

The Sun is usually a benefic planet for Aries, Leo, Scorpio and Sagittarius ascendants. For them, the positive qualities of the Sun like leadership, independence, intelligence and insight can be enhanced by these same measures, even if the Sun is not weak.