Auspicious for good work, for the worship of Shiva in the Pradosha observance, and for love, art and ornament. Jaya class, so also good for contests and vows.
Meaning
Trayodashi is the thirteenth tithi, and its adhidevata is Kamadeva, the god of desire, which is why it is read as favourable for love, for art and for the beautiful. The thirteenth of each fortnight is also the Pradosha day of Shiva's worship.