The maximum angular diameter of any planetary disk as observed from the earth is about 1 minute of arc.

These losses depend on fiber diameter and length, absorption coefficient, the mean value of the loss per internal reflection and last, but not least, on the angular distribution of the incident light.

Astronomers also measure the apparent size of objects as an angular diameter.

For example, the full moon has an angular diameter of approximately 0. 5 °, when viewed from Earth.

The size of Antares may be calculated using its parallax and angular diameter.

The parallax angle is given in the box to the right, and the angular diameter is known from lunar occultation measurements ( 41. 3 ± 0. 1 mas ).

The angular diameter of Altair was measured interferometrically by R. Hanbury Brown and his co-workers at Narrabri Observatory in the 1960s.

A gammadion shaped gold light mill, only 100 nanometers in diameter, was built and illuminated by laser light that had been tuned to have an angular momentum.

The interferometer-measured angular diameter of this star, after correction for limb darkening, is.

If viewed from a distance of 1 astronomical unit, it would span an angular diameter of 35 ° and shine at magnitude − 38.

where λ is the wavelength of the waves that are focused for imaging, D the entrance pupil diameter of the imaging system, in the same units, and the angular resolution δ is in radians.

The beam divergence of an electromagnetic beam is an angular measure of the increase in beam diameter or radius with distance from the optical aperture or antenna aperture from which the electromagnetic beam emerges.

The tooth flanks and outer diameter of the external gear are crowned to allow for angular displacement between the two gears.

Instead, the angular aperture of a lens ( or an imaging mirror ) is expressed by the f-number, written or, which is defined as the ratio of the focal length to the diameter of the entrance pupil:

To determine a star's radius, however, two other metrics are needed: the star's angular diameter and its distance from Earth, usually calculated using parallax.

The angular resolution of a dish style antenna is determined by the diameter of the dish expressed as a number of wavelengths of the electromagnetic radiation being observed.

Also, at most solar eclipses the apparent angular diameter of the Moon is insufficient to fully obscure the solar disc, unless the Moon is close to perigee.

The Moon moves faster when it is closer to the Earth ( near perigee ) and slower when it is near apogee ( furthest distance ), thus periodically changing the timing of syzygies by up to ± 14 hours ( relative to their mean timing ), and changing the apparent lunar angular diameter by about ± 6 %.

Aristarchus pointed out that the Moon and Sun have nearly equal apparent angular sizes and therefore their diameters must be in proportion to their distances from Earth, so that that the diameter of the Sun was between 18 and 20 times larger than the diameter of the Moon.

Also since angular resolution is a function of the diameter of the " objective " in proportion to the wavelength of the electromagnetic radiation being observed, radio telescopes have to be much larger in comparison to their optical counterparts.

At an estimated distance of 110 parsecs from Hipparcos, this corresponds to a radius of about 280 million kilometers ( or 170 million miles ), which is roughly 400R < sub >☉</ sub > or 1. 87 AU .< ref name =" NOTERADIUS " group =" note "> To determine the Rasalgheti's radius in terms of solar units, the calculations begin with the formula for angular diameter as follows:

where δ equals Rasalgheti's angular diameter in arcseconds, d < sub > R </ sub > the star's diameter in AU, and D < sub > R </ sub > the Distance from Earth in parsecs.

The mountain retained its conical shape but with a red granite tone and a more angular summit under a red clouded sky to suggest the appearance of Mount Sinai for this single motion picture.

The angle formed by the angular line also has an inner sonority which is warm and close to yellow for an acute angle ( a triangle ), cold and similar to blue for an obtuse angle ( a circle ), and similar to red for a right angle ( a square ).

However, there are some exceptions concerning shape in the artiodactyl order ( even-toed ungulates including cattle, deer, and their relatives ), which displays a wide variety of bizarre erythrocyte morphologies: small and highly ovaloid cells in llamas and camels ( family Camelidae ), tiny spherical cells in mouse deer ( family Tragulidae ), and cells which assume fusiform, lanceolate, crescentic, and irregularly polygonal and other angular forms in red deer and wapiti ( family Cervidae ).

This was the first red dwarf star to have its angular diameter measured, with the physical diameter being about 46 % of the Sun's radius.

HSL and HSV are both cylindrical geometries (), with hue, their angular dimension, starting at the red primary at 0 °, passing through the green primary at 120 ° and the blue primary at 240 °, and then wrapping back to red at 360 °.

It was assumed that, by conservation of angular momentum, the expansion of the outer layers and contraction of the core as the red giant forms would result in the core rotating faster and the outer layers slower.

If the red bar is present, and the bending rigidity of the blue node is negligible compared to the contributing rigidity of the red bar, the system can be calculated using a rigidity matrix, neglecting angular factors.

Image: Siccar Point red capstone closeup. jpg | Hutton's angular unconformity at Siccar Point where 345 million year old Devonian Old Red Sandstone overlies 425 million year old Silurian greywacke.

Indicated near-universally by an arrow making the prohibited turn overlaid with a red circle with an angular line crossing it.

Tall and slim with angular features and red hair, Martha closely resembled her father.

Elsewhere the " New Street Estate " known locally as " Beth Ave ", after the primary access on New Street, was stigmatised from the beginning as its modern angular construction ( with distinctive angled roof ) and vivid red brick led to it being called " Lego Land ".

At higher angular momenta, there is a significant centrifugal barrier ( orange curve ) and an unstable inner radius, highlighted in red.

The stable and unstable radii are plotted versus the normalized angular momentum a / r < sub > s </ sub > = L / mcr < sub > s </ sub > in blue and red, respectively.

Plants including rigid buckler fern, angular Solomon ’ s seal, limestone fern, and dark red helleborine are to be found on the pavement.

The mummies share many typical Europoid body features ( elongated bodies, angular faces, recessed eyes ), and many of them have their hair physically intact, ranging in color from blond to red to deep brown, and generally long, curly and braided.

The signs and symptoms of riboflavin deficiency typically include sore throat with redness and swelling of the mouth and throat mucosa, cheilosis and angular stomatitis ( cracking of the lips and corners of the mouth ), glossitis ( magenta tongue with atrophy ), seborrheic dermatitis or pseudo-syphilis ( moist, scaly skin particularly affecting the scrotum or labia majora and the nasolabial folds ), and a decreased red blood cell count with normal cell size and hemoglobin content ( normochromic normocytic anemia ).

Multi-Man's angular, red and black costume resembled an oversized, stylized ' M ', and included a short, triangular redcape.

Typically, these alien landscapes are populated with various abstract shapes, sometimes angular and sharp as shards of glass, sometimes with an intriguingly organic look to them, like giant amoebae suddenly turned to stone.

The SKA will combine the signals received from thousands of small antennas spread over a distance of more than 3000 km to simulate a single giant radio telescope capable of extremely high sensitivity and angular resolution.