9:39

Introduction to an Equatorial Sundial

8:06

The horizontal sundial

5:23

A simple Heliochronometer Sun dial

8:45

Build an Ancient Astronomical Instrument

12:11

Make an Equatorial Sundial - Full version

7:42

方位磁石（コンパス）の作り方 How to make a Magnetic Compass

1:58

Sundial History and Basics

9:05

Sun Compass Shadow Stick Method