Tithi and Karana track the Sun–Moon relationship
Tithi divides the changing angular relationship between the Sun and Moon. Karana represents half of a Tithi and therefore changes more frequently.
Vara and Nakshatra locate the day
Vara is the weekday. Nakshatra identifies the lunar mansion occupied by the Moon for the relevant time.
Yoga adds another combined measure
Nitya Yoga is derived from a combined solar and lunar longitude measure. Panchang views place it beside the other limbs and local timing windows.