Mathematica MathWorld Wolfram Science More »

HOME

TOPICS

LATEST

Phases of Planets


	Like the Moon, planets can also have phases. This demonstrates the view of Mercury, Venus, and Earth when viewed from any of these three planets. Planets in inferior orbits undergo complete phase changes like the Moon when viewed from a planet with a superior orbit. Planets in superior orbits only go though minor changes in phase when viewed from a planet with an inferior orbit.


	Contributed by: Jeff Bryant

In our solar system, Mercury and Venus are inferior planets: their orbits are entirely inside the Earth's orbit. When seen from the Earth, inferior planets go through phases, like the Moon's.

An inferior planet on the same side of the sun as the Earth appears dark and is not easy to see. Near the opposite side of the sun, we see the planet nearly in full illumination, and in between, we see crescents of various sizes.

Snapshot 1: Mercury and Venus are both in a crescent phase.

Snapshot 2: Mercury and Venus are both in a first-quarter phase.

Snapshot 3: Venus (left) is in a crescent phase and Mercury (right) is in a last-quarter phase.

Snapshot 4: Venus is in a full phase and Mercury is in a first-quarter phase.

Snapshot 5: Viewed from Mercury, neither the Earth or Venus can be viewed as a crescent since they are both in superior orbits.

Snapshot 6: Viewed from Venus, only Mercury can be seen as a crescent. Earth shows only minor phase changes.

Inferior Conjunction (ScienceWorld)

Superior Conjunction (ScienceWorld)

Elongation (ScienceWorld)

"Phases of Planets" from The Wolfram Demonstrations Project
http://demonstrations.wolfram.com/PhasesOfPlanets/

Contributed by: Jeff Bryant

Report an issue »

Interact with Demonstrations using the latest version of the free Mathematica Player—Download Now

Browse all topics

Browse all education topics

	Source page:
	Email	Name (optional)
	Occupation (optional)	Organization (optional)
	I use Mathematica often occasionally never
	Country (optional) Remember me
	Note: Please do not include anything you consider confidential or proprietary. Your message and contact information may be shared with the author of any specific Demonstration for which you give feedback, but will not otherwise be published or distributed. Privacy Policy »

Wolfram Research

Site Index

RSS

Atom