Light is still being generated after the sun is "set" during Geographically Accurate Sun Positioning

While ad-hoc testing Geographically Accurate Sun Positioning, I found that I could cause the Sun to set and consequentially render from under the map. Light is still being generated even though the sun has "set" This could result in odd shadows from underneath - especially if Landscape isnt set to Shadow Two Sided. I would expect to accurately depict "night time" after the sun sets, the intensity of the directional light is dimmed then turned off. Alternately, it would be nice to have a Geographically Accurate Moon Position opposite of the Sun to give more accurate Night time lighting.

1. Open [Link Removed]
2. Select BP_SunPosition in the World Outliner
3. Ensure the Hours is set to 0
4. Build lighting

Results: Lighting is still being generated from the Sun (directional light) even when it is under the map

Expected Results: When the sun is Geographically ""set"" Light no longer generates from the sun (directional light)