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This is a space pointer!
It lets you select a planet, and time of day, and the arrow will spin around to point to its position in the sky.
This is a very simple project, and can be completed in a couple of hours. The computation of the planet positions are done offline and copied into the Arduino source, thereby simplifying the code required.
You can see it in action here:
Supplies:You need for the physical unit: Two servo motors (the SG90 micro gear servos are cheap, light, and used here)
Some thin balsa wood (2-6 mm thick)

A binding clip and screws (optional)
Small block of wood, for mounting

A pen

And for the electronics:
Three push buttons

One LCD display_
A battery connector

A PP3 battery_
Lots of wires

* A pot (optional, to control LCD brightness)”

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