12-18 năm

Where Are You? Locating by the Sun

Sự khó khăn: ★

Studies on the Shadow of an Obelisk Used as Horizontal Sundial

Sự khó khăn: ★

Measuring the diameter of the Sun

Sự khó khăn: ★

Observations with a Pinhole Camera

Sự khó khăn: ★

Let us measure the excentricity of the terrestrial orbit

Sự khó khăn: ★ ★

Let us observe the daily path of the Sun

Sự khó khăn: ★

Lisa Pathfinder paper model

Sự khó khăn: ★ ★

Hubble Space paper model

Sự khó khăn: ★ ★

Alma transporter paper model

Sự khó khăn: ★ ★

Scale Models

Sự khó khăn: ★ ★ ★ ★

The Sun above and below the local horizon

Sự khó khăn: ★

Black hole

Sự khó khăn: ★ ★ ★

Path of the North pole

Sự khó khăn: ★ ★ ★

Teaching the origin of seasons

Sự khó khăn: ★ ★ ★ ★ ★

The Sun and its daily and annual paths

Sự khó khăn: ★

Sunrise and sunset position change

Sự khó khăn: ★ ★

Solar Motion Demonstrator

Sự khó khăn: ★

Universal simulator of the solar approach movement

Sự khó khăn: ★ ★ ★

Mirror, Mirror 

Sự khó khăn: ★ ★ ★

Hot Air

Sự khó khăn: ★ ★ ★

Delta, Delta, Delta

Sự khó khăn: ★ ★ ★

Telescope Allocation Committee

Sự khó khăn: ★ ★ ★

Astro-Madness

Sự khó khăn: ★ ★ ★

Super Gelatin

Sự khó khăn: ★

Telescope technology

Sự khó khăn: ★