Home ActivitiesExploring the Night Sky Using a Planisphere

Exploring the Night Sky Using a Planisphere

Approx Duration:15-30 Minutes

7 to 1111 to 1414 to 16

Activity

Learning Outcomes

Understand how the night sky changes with time
Identify major constellations and bright stars in the night sky
Use a planisphere as a tool for celestial navigation
Recognize the concept of the rotating sky and Earth’s position in space

Items Required

Printable Planisphere (Click here to Download, cut and assembled as per instructions)
Scissors
Split pin or paper fastener (to assemble rotating disk)
Compass (to identify directions)
Clear outdoor space with visible night sky

Instructions

Assemble the Planisphere: Cut out both circular parts and attach the rotating disk using a split pin through the center. Ensure it rotates smoothly.
Set Your Date & Time: Rotate the top disk to align your local stargazing time with the current date printed on the wheel.
Face North: Go outside to a safe, open space. Use a compass to face North and hold the planisphere above your head, so the N label on the disk faces actual North.
Match the Sky: What you see on the planisphere window should now reflect the visible stars and constellations overhead at that time and date. (Try spotting Orion, Ursa Major, Cassiopeia, etc.)
Optional – Track Sky Movement: Try using the planisphere again a few hours later or on a different date and observe how the sky “moves” or shifts. Discuss why this happens (Earth’s rotation and orbit).

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