Canon SX230

 https://gdlp01.c-wss.com/gds/7/0300004757/01/PSSX230HS_SX220HS_CUG_EN.pdf

Use a tripod and don't touch the camera while it's taking pictures

• Turn off the flash
• Press the > button
• Choose the "no flash" icon
• ISO
• After pressing the "func set" button, press the up/down buttons or turn the dial to choose, then press the "func set" button again.
• Choose 800 or higher ISO 
• Manual Focus
• After pressing the < button, press the <> buttons or turn the dial to choose MF, then press the "func SET" button.
• Focus Roughly
• The side bar shows your focal point and a distance display for the MF indicator. While looking at the magnified area, turn the dial to find an approximate focus. 
• Fine tuning the focus.
• If you press the shutter button halfway, you can fine tune the focus (Safety MF).
• Manual mode
• Set the mode dial to M
• Press the ^ button to choose between shutter speed and aperture value
• Exposure
• When in shutter mode, turn the dial to set shutter speed. 20 second exposures should avoid star trails while gathering enough light to see night sky objects.
• Aperture
• When in aperture mode turn the dial to set the lowest aperture value