When is a vessel operator required to use navigation lights?

During periods of restricted visibility.

Explanation:

Navigation lights are particularly needed when boaters meet at night. These lights have to be used from sunset to sunrise, as well as through times of restricted visibility, like in the case of fog, mist, snow, or heavy rain. The different types of navigation lights are Sidelights, Sternlight, Masthead Light, and All-Round White Light.

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explanation:

"the sepoy rebellion was the result of many, many influences and stressors on the cultures of india living under british rule. in britain, it's called the sepoy mutiny on the indian mutiny, but in india, it's called the first war of independence.

the main reason is concerned to the british paramountcy , the belief in british   dominance in india political, economic and cultural life had been introduced in india about 1820."

"they were forced to grow crops that benefited the colonizing nations instead of feeding their own people."