The use of green light at night serves several purposes in different contexts. Here are a few examples:
Astronomy: Green light is often used in astronomical observations and astrophotography. Green light has a relatively low impact on night vision compared to other colors, such as white or red light. Astronomers use green filters and lighting to minimize the disruption of their night vision while still allowing them to see and navigate in dark environments.
Military and Tactical Applications: Green light is also used in military and tactical operations at night. Similarly to astronomy, green light has a reduced impact on night vision compared to other colors. It allows military personnel to read maps, navigate, and communicate while maintaining their ability to see in the dark without compromising their natural low-light vision.
Aviation: Green lights are used in aircraft for various purposes. For instance, in commercial aviation, the navigation lights on the wings and tail of an aircraft typically include a green light on the right wingtip. This, along with a red light on the left wingtip, helps identify the orientation and direction of an aircraft during night flights.
Marine and Nautical Navigation: Green lights are used in maritime navigation to indicate the starboard (right) side of a vessel. It helps other ships and navigators determine the direction and position of a vessel, especially during nighttime or low visibility conditions.
These are just a few examples of the purposes of green light at night. The specific applications and uses may vary depending on the context and industry.