Position adjustment apparatus and projection system

A position adjustment apparatus comprising:

• a housing including a first space in which a first projector is disposed and a second space in which a second projector is disposed;
• a first rotary table on which the first projector is placed and which is rotatably supported by the housing about a first rotation axis, the first rotary table including a first arc-shaped guide groove;
• and
• a second rotary table on which the second projector is placed and which is rotatably supported by the housing about a second rotation axis parallel to the first rotation axis, the second rotary table including a second arc-shaped guide groove, wherein
• the housing includes a first opening through which first image light projected from the first projector passes, and a second opening through which second image light projected from the second projector passes,
• a rotation direction of the first rotary table and a rotation direction of the second rotary table are opposite to each other,
• rotation of the first rotary table and rotation of the second rotary table are in conjunction with each other, and
• the first rotary table is detachably secured to the housing by a first fastener inserted through the first arc-shaped guide groove, and the second rotary table is detachably secured to the housing by a second fastener inserted through the second arc-shaped guide groove, such that the first rotary table and the second rotary table are configured to be replaceable with respect to the housing.