Astro Skeleton, fly cutter forming the planisphere base design @MarkFrankclocks

Uploaded May 2018 | Updated September 2026, 2 weeks ago

The cutter makes a perfect match between the planisphere base and the main frame base.

Astro Skeleton, fly cutter forming the planisphere base design

Astro-skeleton demo of Earth assembly within the orrery

Yale Type E time lock, 1889, winding and setting

Astro-skeleton, demo of the Jupiter and Saturn components of the orrery

Manual demo of length of day and night dials within the Sun / moon rise-set module

Mark Frank |

Astro Skeleton, fly cutter forming the planisphere base design

Name: Manual demo of length of day and night dials within the Sun / moon rise-set module @MarkFrankclocks
Uploaded: 2017-11-04T01:29:31-0400
Duration: 8 min 17 s
Description: The center dials on the sun / moon rise-set mechanism depict the length in hours of each. Notice that BOTH the dial hands and the dial numbers move past each other. This allows for a greater sweep of the hand across the face of the sector dial and was necessitated because of the small movement that would be had from only having the dial hand in motion.