The perpetual calendar presents a mechanical solution for an astronomical problem. Gears, springs and rockers mimic the rotation of the Earth around the Sun. The mechanism automatically knows whether the month has 28, 30 or 31 days, as well as calculating leap years. The perpetual calendar only needs correcting at…

The perpetual calendar presents a mechanical solution for an astronomical problem. Gears, springs and rockers mimic the rotation of the Earth around the Sun. The mechanism automatically knows whether the month has 28, 30 or 31 days, as well as calculating leap years. The perpetual calendar only needs correcting at…

The perpetual calendar presents a mechanical solution for an astronomical problem. Gears, springs and rockers mimic the rotation of the Earth around the Sun. The mechanism automatically knows whether the month has 28, 30 or 31 days, as well as calculating leap years. The perpetual calendar only needs correcting at…

The perpetual calendar presents a mechanical solution for an astronomical problem. Gears, springs and rockers mimic the rotation of the Earth around the Sun. The mechanism automatically knows whether the month has 28, 30 or 31 days, as well as calculating leap years. The perpetual calendar only needs correcting at…

The perpetual calendar presents a mechanical solution for an astronomical problem. Gears, springs and rockers mimic the rotation of the Earth around the Sun. The mechanism automatically knows whether the month has 28, 30 or 31 days, as well as calculating leap years. The perpetual calendar only needs correcting at…

The perpetual calendar presents a mechanical solution for an astronomical problem. Gears, springs and rockers mimic the rotation of the Earth around the Sun. The mechanism automatically knows whether the month has 28, 30 or 31 days, as well as calculating leap years. The perpetual calendar only needs correcting at…

The perpetual calendar presents a mechanical solution for an astronomical problem. Gears, springs and rockers mimic the rotation of the Earth around the Sun. The mechanism automatically knows whether the month has 28, 30 or 31 days, as well as calculating leap years. The perpetual calendar only needs correcting at…

The perpetual calendar presents a mechanical solution for an astronomical problem. Gears, springs and rockers mimic the rotation of the Earth around the Sun. The mechanism automatically knows whether the month has 28, 30 or 31 days, as well as calculating leap years. The perpetual calendar only needs correcting at…

The perpetual calendar presents a mechanical solution for an astronomical problem. Gears, springs and rockers mimic the rotation of the Earth around the Sun. The mechanism automatically knows whether the month has 28, 30 or 31 days, as well as calculating leap years. The perpetual calendar only needs correcting at…

The perpetual calendar presents a mechanical solution for an astronomical problem. Gears, springs and rockers mimic the rotation of the Earth around the Sun. The mechanism automatically knows whether the month has 28, 30 or 31 days, as well as calculating leap years. The perpetual calendar only needs correcting at…

The perpetual calendar presents a mechanical solution for an astronomical problem. Gears, springs and rockers mimic the rotation of the Earth around the Sun. The mechanism automatically knows whether the month has 28, 30 or 31 days, as well as calculating leap years. The perpetual calendar only needs correcting at…

The perpetual calendar presents a mechanical solution for an astronomical problem. Gears, springs and rockers mimic the rotation of the Earth around the Sun. The mechanism automatically knows whether the month has 28, 30 or 31 days, as well as calculating leap years. The perpetual calendar only needs correcting at…

The perpetual calendar presents a mechanical solution for an astronomical problem. Gears, springs and rockers mimic the rotation of the Earth around the Sun. The mechanism automatically knows whether the month has 28, 30 or 31 days, as well as calculating leap years. The perpetual calendar only needs correcting at…

The perpetual calendar presents a mechanical solution for an astronomical problem. Gears, springs and rockers mimic the rotation of the Earth around the Sun. The mechanism automatically knows whether the month has 28, 30 or 31 days, as well as calculating leap years. The perpetual calendar only needs correcting at…

The perpetual calendar presents a mechanical solution for an astronomical problem. Gears, springs and rockers mimic the rotation of the Earth around the Sun. The mechanism automatically knows whether the month has 28, 30 or 31 days, as well as calculating leap years. The perpetual calendar only needs correcting at…

The perpetual calendar presents a mechanical solution for an astronomical problem. Gears, springs and rockers mimic the rotation of the Earth around the Sun. The mechanism automatically knows whether the month has 28, 30 or 31 days, as well as calculating leap years. The perpetual calendar only needs correcting at…