If you see a vessel displaying only a white light, it indicates that the vessel is a power-driven vessel. This vessel is approaching you head-on or is overtaking you. In both cases, you should be prepared to take action to avoid a collision.
A visible white light indicates that the other vessel is a power-driven vessel.
If you encounter a vessel displaying only a visible white light, it is most likely a power-driven vessel that is underway. In this situation, rules of the road require that you keep to the starboard side and pass at a safe distance. Be cautious and keep a lookout for any other lights displayed by the vessel to determine their course and intentions.
A visible white light on another vessel indicates that it is approaching you head-on. This means you should also exhibit a white light to signify that your vessel is also approaching head-on.
Neither can "come first" - for darkness to exist there must be an absence of light. But for light to exist there must be something to burn, and before there was anything burning there would have been darkness. But.... as there would have been nothing to observe the darkness - as nothing can exist without light - then one can say that light and darkness are mutually necessary. You can't have one without the other.
One way to prove the presence of diffused air in water is by observing the formation of bubbles when the water is agitated or heated. Another method is to measure the dissolved oxygen levels in the water using a dissolved oxygen meter, as air typically contains oxygen gas.
You are approaching the stern of another vessel and may be overtaking it
A visible white light indicates that the other vessel is a power-driven vessel.
You are approaching the stern of another vessel
Robinson Crusoe found the footprint in the sand on his 15th year of solitude on the island, after encountering it while exploring the shore. This discovery sparked fear and suspicion as it indicated the presence of another human on the island.
You are approaching the starboard side of another vessel
If you encounter a vessel displaying only a visible white light, it is most likely a power-driven vessel that is underway. In this situation, rules of the road require that you keep to the starboard side and pass at a safe distance. Be cautious and keep a lookout for any other lights displayed by the vessel to determine their course and intentions.
The other vessel is coming directly toward the observer, so both the port and starboard running lights are visible.
The other vessel is coming directly toward the observer, so both the port and starboard running lights are visible.
Encountering or meeting unexpectedly
A visible white light on another vessel indicates that it is approaching you head-on. This means you should also exhibit a white light to signify that your vessel is also approaching head-on.
How the two vessels are propelled
It would help if the "denominator indicated" was actually indicated!