RealNav navigation..

[Notewire]

Originally Posted by vanjast

Notewire,
In real life the sunrise/set is when the upper rim of the sun just becomes/dissapears above/below the horizon.
The game sunrise/set times are set to when only half of the sun is visible on the horizon. The time taken from upper rim to complete sun is about 4-6 minutes depending on your latitude. The higher the latitudes the longer it takes as the sun travels at a much shallower angle to the horizon.

There is a slight difference in the Mods RL almanac compared to the game times. It can be as much as 4 minutes (1 Degree Longitude). Not a 'train-smash' but as long as you are aware of these conditions.

I have not had time to go over the whole lot as family and RL is on top of me, but will do when I have a break.



From the US Naval Observatory Website

Sunrise and sunset conventionally refer to the times when the upper edge of the disk of the Sun is on the horizon, considered unobstructed relative to the location of interest. Atmospheric conditions are assumed to be average, and the location is in a level region on the Earth's surface.

Moonrise and moonset times are computed for exactly the same circumstances as for sunrise and sunset. However, moonrise and moonset may occur at any time during a 24 hour period and, consequently, it is often possible for the Moon to be seen during daylight, and to have moonless nights. It is also possible that a moonrise or moonset does not occur relative to a specific place on a given date.

Civil twilight is defined to begin in the morning, and to end in the evening when the center of the Sun is geometrically 6 degrees below the horizon. This is the limit at which twilight illumination is sufficient, under good weather conditions, for terrestrial objects to be clearly distinguished; at the beginning of morning civil twilight, or end of evening civil twilight, the horizon is clearly defined and the brightest stars are visible under good atmospheric conditions in the absence of moonlight or other illumination. In the morning before the beginning of civil twilight and in the evening after the end of civil twilight, artificial illumination is normally required to carry on ordinary outdoor activities. Complete darkness, however, ends sometime prior to the beginning of morning civil twilight and begins sometime after the end of evening civil twilight.

Nautical twilight is defined to begin in the morning, and to end in the evening, when the center of the sun is geometrically 12 degrees below the horizon. At the beginning or end of nautical twilight, under good atmospheric conditions and in the absence of other illumination, general outlines of ground objects may be distinguishable, but detailed outdoor operations are not possible, and the horizon is indistinct.


Astronomical twilight is defined to begin in the morning, and to end in the evening when the center of the Sun is geometrically 18 degrees below the horizon. Before the beginning of astronomical twilight in the morning and after the end of astronomical twilight in the evening the Sun does not contribute to sky illumination; for a considerable interval after the beginning of morning twilight and before the end of evening twilight, sky illumination is so faint that it is practically imperceptible.

Thanks Vanjast, as an Army guy IRL, we use BMNT and EMNT - (Nautical Twilight, as explained above) - I will start using the game's "half sun" navigation.

Thanks for your time,
Notewire.