Twilight Hours

-Dusk and Dawn have unique variables and considerations that we should take into account.

-First, it is important to know where the sun is rising and setting in an observation capacity. If what you’re observing is between you and the sun when it is low in the sky, observation through optics becomes extremely difficult and may cause glint off lenses, giving away your position. Reduce this with bug netting and putting cat eyes on your objective lenses.

-Use of NODs also has to be adapted. During twilight shadows are very dark but the use of the naked eye is still very viable. If you have articulating NODs like DTNVGs or PVS31As, running one tube down while also observing from an unaided eye can help with reading lighting conditions while being able to observe the dark shadows.

-Skyglow is much more prevalent after sunset than prior to sunrise, so expect NVGs to get washed out looking west late in the day more than looking east early on.

-If you have people on your team without NODs, dawn and dusk are peak operating hours if you are moving against an advisory.
This also means that dawn and dusk are where you should make security your top priority.