Meanings of operate day in English

The observatory would operate day and night in all w(...)

The observatory would operate day and night in all weathers, and could be moved throughout the 700sq km Kerry International Dark-Sky Reserve.

But to operate day-to-day, the business requires billions of dollars of bank lines of credit, funding that's difficult to secure given the sanctions.

But to operate day-to-day, the business requires billions of dollars of bank lines of credit, funding that is difficult to secure given the sanctions.

Reinforcements were sent him in the ensuing three weeks, and during that period the rail and automobile services operated day and night, hurrying up reinforcements.