Penumbra Foundation

Eventbrite - Penumbra Foundation presents Penumbra Foundation Rooftop Party - Thursday, October 17, 2019 at Penumbra Foundation, New. PENUMBRA FOUNDATION. 36 EAST 30TH STREET, NEW YORK, NY Tax-exempt since Oct. EIN:; Classification (NTEE).

Join us Thursday, October 17th from 6-9PM for a fall evening on our rooftop. Our bar will be serving light fare and refreshments, and at the end of the evening there will be a raffle drawing.We have had overwhelming support in the past year, and would love to share our gratitude with friends, old and new.Come see what we are up to. Explore the Penumbra Foundation.We hope you will join us!.Prizes:.- Lomography Camera- Kodak Professional FILM and more.- 8x10' Tintype Portrait Studio Session- $100 Gift Card Brooklyn Film Camera- $150 gift certificate for My Own Color Lab- Book: Col.or by Marco Breuer- Book: Central Park New York by Jeff Chen-Hsing Liao- Book: Lakes and Reservoirs by Matthew Brandt- Sign up for our membership and enter raffle for $500 workshop gift card.

The umbra, penumbra and antumbra3d online racing games. 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 (such as a point source) of light, only the umbra is cast.

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These names are most often used for the shadows cast by celestial bodies, though they are sometimes used to describe levels, such as in sunspots.

Umbra[edit]

The umbra (Latin for 'shadow') is the innermost and darkest part of a shadow, where the light source is completely blocked by the occluding body. An observer in the umbra experiences a total eclipse. The umbra of a round body occluding a round light source forms a right circular cone; to a viewer at the cone's apex, the two bodies are equal in apparent size. The distance from the Moon to the apex of its umbra is roughly equal to that between the Moon and Earth (384,402 km (238,856 mi)). Since Earth's diameter is 3.70 times the Moon's, its umbra extends correspondingly farther: roughly 1,400,000 km (870,000 mi).^[1]

Penumbra[edit]

The penumbra (from the Latin paene 'almost, nearly') is the region in which only a portion of the light source is obscured by the occluding body. An observer in the penumbra experiences a partial eclipse.An alternative definition is that the penumbra is the region where some or all of the light source is obscured (i.e., the umbra is a subset of the penumbra). For example, NASA's Navigation and Ancillary Information Facility defines that a body in the umbra is also within the penumbra.^[2]

Antumbra[edit]

The antumbra (from Latin ante, 'before') is the region from which the occluding body appears entirely within the disc of the light source. An observer in this region experiences an annular eclipse, in which a bright ring is visible around the eclipsing body. If the observer moves closer to the light source, the apparent size of the occluding body increases until it causes a full umbra.^[3]

See also[edit]

References[edit]

1. ^Pogge, Richard. 'Lecture 9: Eclipses of the Sun & Moon'. Astronomy 161: An Introduction to Solar System Astronomy. Ohio State University. Retrieved July 16, 2015.
2. ^Event Finding Subsystem Preview Navigation and Ancillary Information Facility.
3. ^'Eclipses: What Is the Antumbra?'. timeanddate.com. Retrieved 26 May 2019.