Why would you want to know your latitude? If you have solar panels, you can use your latitude to know how much to tilt your solar panel to absorb the most direct sunlight.
Made a quick rocket stove with bricks. Put a Peltier cooler on the back and got a fire going. Measured the current, volts, and watts produced from a single Peltier cooler. A cooling fan and aluminum heatsink with a 12V portable battery helped.
Peltier Cooler (also called TEC or Thermo Electric Cooler) - resting against a hot brick
A 12V battery is getting low and needs some wind to charge up. The wind turbine outside faithfully stands watch high above the ground, waiting for a chance to spin in the wind.
Review of a 12V splitter. This is also called a 3-way cigarette lighter adapter .
12V adapter-splitter review
This adapter plugs into a single 12V battery outlet and splits it into three outlets. Could be used to power three gadgets from your car or from wherever else you have a 12V outlet. I have one in my house for off-the-grid backup power.
The video below shows how to make a combiner box to allow solar panels and a wind turbine to charge the same battery. Also shown in the video: How to make an extension cord out of spare CRT cables and heat shrink.