Observatory maintenance involves the upkeep and regular servicing of astronomical observatories and their equipment to ensure their optimal functioning and performance. This includes tasks such as cleaning telescopes and lenses, calibrating instruments, repairing any faulty equipment, and keeping the observatory infrastructure and facilities in good working order. Regular maintenance is essential to ensure the accuracy and reliability of observations and to prolong the lifespan of the equipment. Additionally, observatory maintenance also involves monitoring environmental factors such as humidity, temperature, and light pollution that can affect the quality of observations.