Note
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Day-night terminator line and twilights
Use pygmt.Figure.solar
to show the different transition stages between
daytime and nighttime. The parameter terminator
is used to set the twilight
stage, and can be either "day_night"
(brightest), "civil"
,
"nautical"
, or "astronomical"
(darkest).
Refer to https://en.wikipedia.org/wiki/Twilight for more information.
![solar](../../_images/sphx_glr_solar_001.png)
import datetime
import pygmt
fig = pygmt.Figure()
# Create a figure showing the global region on a Mollweide projection
# Land color is set to dark green and water color is set to light blue
fig.coast(region="d", projection="W0/15c", land="darkgreen", water="lightblue")
# Set a time for the day-night terminator and twilights, 17:00 UTC on
# January 1, 2000
terminator_datetime = datetime.datetime(
year=2000, month=1, day=1, hour=17, minute=0, second=0
)
# Set the pen line to be 0.5 points thick
# Set the fill for the night area to be navy blue at different transparency
# levels
fig.solar(
terminator="day_night",
terminator_datetime=terminator_datetime,
fill="navyblue@95",
pen="0.5p",
)
fig.solar(
terminator="civil",
terminator_datetime=terminator_datetime,
fill="navyblue@85",
pen="0.5p",
)
fig.solar(
terminator="nautical",
terminator_datetime=terminator_datetime,
fill="navyblue@80",
pen="0.5p",
)
fig.solar(
terminator="astronomical",
terminator_datetime=terminator_datetime,
fill="navyblue@80",
pen="0.5p",
)
fig.show()
Total running time of the script: (0 minutes 0.360 seconds)