Robert Makemson Guide to Astronomy in Jacksonville

Basics for Telescopes

Robert Makemson Designs Dome Homes
Observational Physics
Earth and Planetary Science
Outer Limits of Space
Tonight's Sky for Jacksonville Astronomy
Virtual Interactive Solar-system Telescope

Small Telescope Visibility Guide

Seeing can be rated as follows: (consider a high power view - 30-40X/inch)

 I - Boiling image without any sign of diffraction pattern.

II - Important eddy streams in the central disc. Missing or partly missing diffraction rings.

 III - Central disc deformations. Broken diffraction rings.

 IV - Light undulations across diffraction rings.

V - Perfect motionless diffraction pattern.