mirror of
https://github.com/nasa/trick.git
synced 2024-12-23 15:02:25 +00:00
53 lines
2.4 KiB
Markdown
53 lines
2.4 KiB
Markdown
# SIM\_sun
|
|
|
|
|
|
|
|
### The Simulation
|
|
SIM\_sun is a simulation of the Sun's movement across the sky.
|
|
Given the location (latitude, longitude) of an observer on the
|
|
Earth, the timezone (offset from UTC), and a starting local time,
|
|
this simulation calculates the position of the Sun in the sky over time.
|
|
|
|
### Inputs
|
|
Variable | Type | Units
|
|
-----------------------------------------------|----------------|-------
|
|
sun\_predictor.sun.observer\_latitude | double | degree
|
|
sun\_predictor.sun.observer\_longitude | double | degree
|
|
sun\_predictor.sun.observer\_offset\_from\_UTC | int | hr
|
|
sun\_predictor.sun.local\_time | CALENDAR\_DATE | --
|
|
|
|
### CALENDAR\_DATE
|
|
Member | Type | Units
|
|
---------------------------|--------------------|---------
|
|
year | int | --
|
|
month | int | --
|
|
day | int | day
|
|
hour | int | hour
|
|
min | int | min
|
|
sec | double | s
|
|
|
|
### Outputs
|
|
Variable | Type | Units
|
|
-------------------------------------------------|----------------|--------
|
|
sun\_predictor.sun.JD | double | day
|
|
sun\_predictor.sun.right\_ascension | double | degree
|
|
sun\_predictor.sun.declination | double | degree
|
|
sun\_predictor.sun.hour\_angle | double | degree
|
|
sun\_predictor.sun.local\_sidereal\_time | double | s
|
|
sun\_predictor.sun.sidereal\_time\_at\_Greenwich | double | s
|
|
sun\_predictor.sun.solar\_azimuth | double | degree
|
|
sun\_predictor.sun.solar\_elevation | double | degree
|
|
sun\_predictor.sun.local\_time | CALENDAR\_DATE | --
|
|
sun\_predictor.sun.utc | CALENDAR\_DATE | --
|
|
|
|
**NOTE:** 0 <= Solar Azimuth < 360 degrees. North = 0, East = 90, South = 180, West = 270.
|
|
|
|
### Scenarios
|
|
|
|
#### [RUN_Winter](RUN_Winter/RESULTS.md)
|
|
|
|
#### [RUN_Summer](RUN_Summer/RESULTS.md)
|
|
|
|
### References
|
|
Meeus, Jean, (1998) "Astronomical Algorithms", Willmann-Bell, Inc. ISBN 0-943396-61-1.
|