Definitions

1. noun

A diagram or drawing to show the positions of stars on the celestial sphere at a given time, especially one used to help with navigation.

“The sailors used a dygogram to determine the correct course to take for their voyage.”

2. noun

A diagram showing the position of celestial bodies at a particular time, used for navigation or other purposes.

“The astronomer created a dygogram to illustrate the alignment of the planets.”