is a two-dimensional GeoGraphics primitive that represents the half of the Earth currently in darkness.
NightHemisphere[datespec]
represents the night half of the Earth for the specified date.


NightHemisphere
is a two-dimensional GeoGraphics primitive that represents the half of the Earth currently in darkness.
NightHemisphere[datespec]
represents the night half of the Earth for the specified date.
Details

- datespec can be a DateObject or a string that resolves to a date.
- A date without explicit time zone is assumed to use $TimeZone.
Examples
open all close allBasic Examples (2)
Scope (3)
NightHemisphere[] gives a plot for the current date and time:
Using Now explicitly gives the same result:
Illustrate changes in the unilluminated hemisphere at different times of day and year:
Tech Notes
Related Guides
History
Text
Wolfram Research (2014), NightHemisphere, Wolfram Language function, https://reference.wolfram.com/language/ref/NightHemisphere.html.
CMS
Wolfram Language. 2014. "NightHemisphere." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/NightHemisphere.html.
APA
Wolfram Language. (2014). NightHemisphere. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/NightHemisphere.html
BibTeX
@misc{reference.wolfram_2025_nighthemisphere, author="Wolfram Research", title="{NightHemisphere}", year="2014", howpublished="\url{https://reference.wolfram.com/language/ref/NightHemisphere.html}", note=[Accessed: 13-August-2025]}
BibLaTeX
@online{reference.wolfram_2025_nighthemisphere, organization={Wolfram Research}, title={NightHemisphere}, year={2014}, url={https://reference.wolfram.com/language/ref/NightHemisphere.html}, note=[Accessed: 13-August-2025]}