Vakya tradition maps specific Nakshatras to body parts. If your online horoscope shows a weak Moon in a specific house, the Panchangam will suggest dietary changes or specific prayers ( Pariharam ) like lighting a lamp or visiting a specific temple (e.g., Thingalur for Moon, Vaitheeswaran Koil for Mars).
Most online tools have a "Today's Horoscope" section based on Vakya. It will tell you: Tamil Vakya Panchangam Horoscope Online