# '''Check the weather conditions'''. If they are within the specified [[40" / 1.0m#Observing Limits |limits]], continue with step 2.
# '''Switch off the [[40" / 1.0m#A guided tour of the dome:#Light switches|lights]] in the foyer''' using the switches to the right of the stairs.
# '''Switch off any other downstairs lights''' (kitchen, toilet, etc.).
# '''Switch off the observing floor incandescent lights''' (switch at top of stairs) '''and fluorescent lights''' (switch inside '''small''' door to warm room).