In astronomy, conjunction means two or more astronomical bodies share the same right ascension, therefore they appear close together, usually just a few degrees apart. A conjunction can occur between moon and planet, or a planet or star and moon, and it can happen multiple times a month. Since the Moon and planets move along the ecliptic at different speeds, they pass each other from time to time.
In some rare cases, such as conjunction Uranus and Neptune happen once every 171 years. This happens due to the slow movement, taking 84 and 165 years respectively to make a complete circuit through the constellation. The moon, however, moves much faster and passes conjunction with every planet roughly once a month.
Conjunction between Moon and Saturn.
For more conjunction image,click here.