is a one-dimensional GeoGraphics primitive that represents the separation line between the halves of the Earth currently in daytime and nighttime.
represents the separation line between day and night for the specified date.
- datespec can be specified as a DateObject or a string that resolves to a date.
- A date without explicit time zone is assumed to use $TimeZone.
Examplesopen allclose all
Basic Examples (2)
DayNightTerminator gives a plot for the current date and time:
Using Now explicitly gives the same result:
Illustrate changes in the terminator at monthly intervals:
Properties & Relations (3)
The terminator line separates the day and night hemispheres:
Next lunar eclipse to a given date:
The night hemisphere coincides with the total phase area of the eclipse:
For a spherical model of the Earth, the terminator line is approximately a geo circle:
The true terminator and approximate terminator geo circle differ slightly when using an ellipsoidal model of the Earth:
Wolfram Research (2014), DayNightTerminator, Wolfram Language function, https://reference.wolfram.com/language/ref/DayNightTerminator.html.
Wolfram Language. 2014. "DayNightTerminator." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/DayNightTerminator.html.
Wolfram Language. (2014). DayNightTerminator. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/DayNightTerminator.html