Week , Calendar epoch , Month , Lunisolar calendar , and Computus Equinox seen from the astronomic calendar of Pizzo Vento at Fondachelli Fantina , Sicily The course of the sun and the moon are the most salient natural, regularly recurring events useful for timekeeping , thus in pre-modern societies worldwide lunation and the year were most commonly used as time units. Nevertheless, the Roman calendar contained remnants of a very ancient pre-Etruscan month solar year. This was mostly based on observation, but there may have been early attempts to model the pattern of intercalation algorithmically, as evidenced in the fragmentary 2nd-century Coligny calendar. The Julian calendar was no longer dependent on the observation of the new moon but simply followed an algorithm of introducing a leap day every four years. This created a dissociation of the calendar month from the lunation. The Islamic calendar is based on the prohibition of intercalation nasi' by Muhammad , in Islamic tradition dated to a sermon held on 9 Dhu al-Hijjah AH 10 Julian date:
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Model (art) - Wikipedia
Sitting Standing back view Poses fall into three basic categories: Within each of these there are varying levels of difficulty, so one kind is not always easier than another. Artists and life drawing instructors will often prefer poses in which the body is being exerted, for a more dynamic and aesthetically interesting subject. Common poses such as standing twists, slouched seated poses and especially the classical contrapposto are difficult to sustain accurately for any amount of time, although it is often surprising what a skilled model can do. The model's level of experience and skill may be taken into account in determining the length of the posing session and the difficulty of the poses. While posing, a model is expected to remain essentially motionless,  and usually remains silent. To accommodate the physical limitations, a schedule such as 20 to 25 minutes of posing, with five- or ten-minute breaks is observed.
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