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A lunar eclipse occurs when the Moon moves into the Earth's shadow. This can occur only when the Sun, Earth, and Moon are exactly or very closely aligned with Earth between the other two, and only on the night of a full moon. The type and length of a lunar eclipse depend on the Moon's proximity to either node of its orbit.
The umbra, penumbra and antumbra are three distinct parts of a shadow, created by any light source after impinging on an opaque object. Assuming no diffraction, for a collimated beam of light, only the umbra is cast.
A shadow is a dark area where light from a light source is blocked by an opaque object. It occupies all of the three-dimensional volume behind an object with light in front of it. The cross section of a shadow is a two-dimensional silhouette, or a reverse projection of the object blocking the light.
"Penumbra" is the 167th episode of the television series Star Trek: Deep Space Nine, the 17th episode of the seventh season. It aired on syndicated television the week of April 5, 1999.
The magnitude of eclipse is the fraction of the angular diameter of a celestial body being eclipsed. This applies to all celestial eclipses. The magnitude of a partial or annular solar eclipse is always between 0.0 and 1.0, while the magnitude of a total solar eclipse is always greater than or equal to 1.0.
Penumbra: Overture is the first in a series of episodic survival horror games developed by Frictional Games. It was originally intended as the first episode of a trilogy. With the announcement of the second episode, Penumbra: Black Plague, it was stated that the second game would be the final chapter. However, an expansion has been released since then: Penumbra: Requiem, technically giving the series a third chapter.
Penumbra: Black Plague is the second installment of the Penumbra series of episodic video games developed by Frictional Games. The story continues from the previous episode, Penumbra: Overture, showing the protagonist Philip moving away from the abandoned mine setting of the original to explore an underground research base. Black Plague was released in February 2008 to generally favourable reviews from critics. Although originally intended to conclude the series, a further expansion called Penumbra: Requiem was released later that year.
In pathology and anatomy the penumbra is the area surrounding an ischemic event such as thrombotic or embolic stroke. Immediately following the event, blood flow and therefore oxygen transport is reduced locally, leading to hypoxia of the cells near the location of the original insult. This can lead to hypoxic cell death (infarction) and amplify the original damage from the ischemia; however, the penumbra area may remain viable for several hours after an ischemic event due to the collateral arteries that supply the penumbral zone.
Penumbra: Requiem is an expansion pack to the game Penumbra: Black Plague developed by Frictional Games.
The Penumbra Theatre Company, an African-American theatre company in Saint Paul, Minnesota, was founded by Lou Bellamy in 1976. The theater has been recognized for its artistic quality and its role in launching the careers of playwrights including two-time Pulitzer Prize-winner August Wilson.
A total penumbral lunar eclipse is a lunar eclipse that occurs when the Moon becomes completely immersed in the penumbral cone of the Earth without touching the umbra.
Gamma of an eclipse describes how centrally the shadow of the Moon or Earth strikes the other body. This distance, measured at the moment when the axis of the shadow cone passes closest to the center of the Earth or Moon, is stated as a fraction of the equatorial radius of the Earth or Moon.
Saros cycle series 137 for solar eclipses occurs at the Moon's ascending node. It repeats every 18 years, 11 days, and contains 70 events. 55 of these are umbral eclipses and other 15 of these are partial solar eclipses. All eclipses in this series occurs at the Moon's ascending node.
Penumbra is an episodic survival horror video game series developed by Frictional Games and published by Paradox Interactive and Lexicon Entertainment. The games use the HPL Engine 1, initially developed as a tech demo. Penumbra is notable for its horror styling and for allowing advanced physical interaction with the game environment.
Mikko Tarmia is a Finnish video game music composer known for working with Codeblender Software, Frictional Games, and Wolfire Games. He founded the independent record label The Sound of Fiction.
Gianluigi Gasparetti, known by the pseudonym Oöphoi, was an Italian ambient musician. He is perhaps best known for his role as the editor of Deep Listenings, an Italian magazine dedicated to ambient and deep atmospheric music, where he has featured interviews with many famous ambient artists including Steve Roach and Michael Stearns. Oöphoi's music can be characterized as being static, organic and minimalistic. It has an overall solid and monolithic feel to it, often integrated in a meditative and spiritual context. Created by using synths, singing bowls, flutes, and processed voices, his recordings have relatively slight harmonic variations. Gianluigi Gasparetti died in 2013 after a long illness.
A total lunar eclipse took place on September 25, 1950 and September 26, 1950, the second of two total lunar eclipses in 1950. This total lunar eclipse was very shallow because it had an umbral eclipse magnitude of only 1.07834. This was the first of 27 total lunar eclipses of Saros cycle 136. Gamma had a value of 0.41012 and umbral eclipse magnitude of only 1.07834. Totality lasted 44 minutes and 16 seconds. The moon entered the penumbra at 01:21:40 UTC and exited the penumbra at 07:11:49 UTC on the same day. The moon entered the umbra at 02:31:47 UTC and exited at 06:01:34 UTC. Totality lasted 44 minutes and 16 seconds, between 03:54:28 UTC and 04:38:49 UTC.
Penumbra is a Mexican telenovela produced by Televisa for Telesistema Mexicano in 1962.
El Gamma Penumbra is a Filipino all male shadow play group, best known for being the winners of the first season of Asia's Got Talent.
In United States constitutional law, the penumbra includes a group of rights derived, by implication, from other rights explicitly protected in the Bill of Rights. These rights have been identified through a process of "reasoning-by-interpolation", where specific principles are recognized from "general idea[s]" that are explicitly expressed in other constitutional provisions. Although researchers have traced the origin of the term to the nineteenth century, the term first gained significant popular attention in 1965, when Justice William O. Douglas's majority opinion in Griswold v. Connecticut identified a right to privacy in the penumbra of the constitution.
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