големина

големина

Astronomical brightness measured on a logarithmic scale, based on the ancient practice of noting that the brightest stars in the sky were of "first importance" or "first magnitude", the next brightest being "second magnitude" etc. The human eye is a logarithmic detector, and in 1854 Pogson formalized this scale and defined a difference of 5 magnitudes to be exactly a factor of 100 in brightness. The scale is calibrated to the bright star Vega which is defined to have a magnitude of 0. For reference, the faintest naked-eye magnitude visible from a dark site is +6. Comet C/1996 B2 Hyakutake reached magnitude 0 in late March 1996.

0 0

Cải thiện

Thêm hình ảnh

Loại từ: noun
Từ đồng nghĩa:
Blossary:
Ngành nghề/Lĩnh vực: Astronomy
Category: Planetary science
Company: PSRD
Sản phẩm:
Viết tắt-Từ viết tắt:

Thêm vào Bảng chú giải thuật ngữ của tôi

Ngôn ngữ khác:

Thuật ngữ liên quan

аголна големина

Astronomy; General astronomy

The angle subtended by an object on the sky. For example, the angular size of the moon is 30 arcminutes.

големина на порција

Fitness; Diet

This is the given portion or amount of food used for reference purposes on a product’s food label.

големина на платно

Design; Design

The full area of an image.

под нормалната големина

Education; SAT vocabulary

Of less than the customary size.

големина на сијалицата

Lights & lighting; Lighting products

Bulb shape followed by its size (the maximum diameter of the bulb expressed in eighths of an inch). For Compact Fluorescent products, "S", "D", "T", and "Q" are used to represent ...

метеорит

Astronomy; Planetary science

A natural solid object (metallic or stony/silicate) larger than 10 µm (microns) that has traveled through space, by natural means from the celestial body on which it formed, and ...

хелиум

Astronomy; Planetary science

An element with atomic number 2; symbol: He. It is the second most common element in the Sun and outer planets, but rare on the rocky planets.

кратер

Astronomy; Planetary science

A hole or depression. Most are roughly circular or oval in outline. On Earth most natural craters are of volcanic origin. On the Moon most are of impact origin.

магматски океан

Astronomy; Planetary science

Term used to describe the layer of magma, hundreds of kilometers thick; thought to have covered the Moon 4. 5 billion years ago. The timing, duration, cooling rates, convection, ...

негравитациони сили

Astronomy; Planetary science

Forces that alter the path of a comet, which are not caused by gravitational interaction with the Sun and planets. Typically this refers to uneven outgassing from vents on the ...

астронаут

Astronomy; Planetary science

Person engaged in or trained for spaceflight.

Terms in the News

Featured Terms

zocipro

0
Terms
0
Bảng chú giải
18
Followers

Ngành nghề/Lĩnh vực: Holiday Category: National holidays

Канада Ден

Канада ден го слави на Сојузот на трите британски колонии (Нова Шкотска, Њу Бранзвик, и провинција на Канада) во она што е денешна Канада. Британскиот ...