In Euclidean geometry, an angle is the figure formed by two rays, called the sides of the angle, sharing a common endpoint, called the vertex of the angle. Angles formed by two rays are also known as plane angles as they lie in the plane that contains the rays. Angles are also formed by the intersection of two planes; these are called dihedral angles. Two intersecting curves may also define an angle, which is the angle of the rays lying tangent to the respective curves at their point of intersection.
The radian, denoted by the symbol rad, is the unit of angle in the International System of Units (SI) and is the standard unit of angular measure used in many areas of mathematics. It is defined such that one radian is the angle subtended at the centre of a circle by an arc that is equal in length to the radius. The unit was formerly an SI supplementary unit and is currently a dimensionless SI derived unit, defined in the SI as 1 rad = 1 and expressed in terms of the SI base unit metre (m) as rad = m/m. Angles without explicitly specified units are generally assumed to be measured in radians, especially in mathematical writing.
Timothy Westwood is a British DJ and presenter. He is often referred to by other DJs and artists appearing on his shows simply as Westwood. He was described by The Guardian in 2022 as "a veteran of the hip-hop scene whose opinions have been able to make or break upcoming artists for more than 30 years". He hosted the Radio 1 rap show and presented the MTV UK show Pimp My Ride UK. In 2013, he left Radio 1 and 1Xtra after nearly twenty years and returned to Capital Radio. Investigations by the BBC and The Guardian into Westwood's sexual conduct found seven women who accused Westwood of sexual violence, as described in the BBC Three documentary Tim Westwood: Abuse of Power.
In orbital mechanics, mean motion is the angular speed required for a body to complete one orbit, assuming constant speed in a circular orbit which completes in the same time as the variable speed, elliptical orbit of the actual body. The concept applies equally well to a small body revolving about a large, massive primary body or to two relatively same-sized bodies revolving about a common center of mass. While nominally a mean, and theoretically so in the case of two-body motion, in practice the mean motion is not typically an average over time for the orbits of real bodies, which only approximate the two-body assumption. It is rather the instantaneous value which satisfies the above conditions as calculated from the current gravitational and geometric circumstances of the body's constantly-changing, perturbed orbit.
Graphium is a genus of mostly tropical swallowtail butterflies commonly known as swordtails, kite swallowtails, or ladies. Native to Eurasia, Africa, and Oceania, the genus is represented by over 100 species. Their colouration is as variable as the habitats they frequent; from rainforest to savannah. Some possess tails which may be long and swordlike, while others lack any hindwing extensions. Graphium species are often sighted at mud puddles.
The Satyrini is one of the tribes of the subfamily Satyrinae. It includes about 2200 species and is therefore the largest tribe in the subfamily which comprises 2500 species.
Acherontia styx, the lesser death's head hawkmoth or bee robber, is a sphingid moth found in Asia, one of the three species of death's-head hawkmoth. It is very fond of honey, and bee keepers have reported finding dead moths in their hives as a result of bee stings. They can mimic the scent of bees so that they can enter a hive unharmed to get honey. Their tongue, which is stout and very strong, enables them to pierce the wax cells of the beehive and suck the honey out. They are also known to be a pest of yuzu in South Korea, using their tongue to pierce and damage the fruit.
The noctuid (owlet) moth genus Cydosia is the only member of the tribe Cydosiini in the subfamily Acontiinae. The genus was erected by James Duncan with John O. Westwood in 1841. The few species occur from Argentina along the Andes to the Caribbean and Central America, reaching into the southern United States. The unusual format for the authority citation is explained at Butterflies and Moths of the World as "The difficulty can best be overcome by attributing Westwood with anonymous junior authorship."
Apsarasa is a genus of moths of the family Noctuidae. The genus was erected by Frederic Moore in 1867.
Oporophylla is a monotypic moth genus in the family Noctuidae. The genus was erected by George Hampson in 1913. Its only species, Oporophylla ustulata, was first described by Westwood in 1848. It is found in Bangladesh.
Scrobigera is a genus of moths of the family Noctuidae. The genus was erected by Karl Jordan in 1896.
Apsarasa praslini is a moth of the family Noctuidae first described by Jean Baptiste Boisduval in 1832. It is found in south-eastern Asia, from the Moluccas eastward.
Bombyx huttoni, or the chocolate-tipped silk moth, is a moth belonging to the silk moth family, Bombycidae. It is closely related to the domestic silk moth.
Apsarasas Kangri is a mountain in the Siachen subrange of the Karakoram mountain range. With an elevation of 7,245 m (23,770 ft) it is the 96th highest mountain in the world. Apsarasas Kangri is located within the broader Kashmir region disputed between India, Pakistan and China. It is situated on the border between the areas controlled by China as part of the Xinjiang autonomous region, and the Siachen Glacier controlled by India as part of Ladakh.
