(Roman) The Kalends (first day of the month) are sacred to Juno Regina (Juno Queen of the Gods). The Kalends ritual is performed at the lararium (the household shrine).
The Kalends ritual is usually celebrated early in the morning at sunrise by the head of the household (usually the eldest male). If circumstances (or family tradition) dictate, it may be performed at noon or before sunset. No sexual activity is permitted prior to the rite. The performer of the rite does not break his fast prior to performing the rite (if celebrated at sunrise); only a little tea or coffee is permitted. (http://www.novaroma.org/religio_romana/ritual_kalends_l.html)