From that point of observation, during the summer solstice sun rose in line with the local hill of Mount Lycabetus, while six months later, during the winter solstice, sunrise occurs over the high brow of Mount Hymettos in the southeast.
22.
In astronomy, one often measures spatial resolution in data points per arcsecond subtended at the point of observation, because the physical distance between objects in the image depends on their distance away and this varies widely with the object of interest.
23.
If the bounding surface is a sphere, and the point of observation is at the center of this sphere, the integration over the surface of the sphere is zero : the positive and negative surface charge contributions to the potential cancel.
24.
100pxA pressure hypsometer as shown in the drawing ( right ) employs the principle that the boiling point of a liquid is lowered by diminishing the barometric pressure, and that the barometric pressure varies with the height of the point of observation.
25.
Polaris itself remains almost stationary, always at the north ( i . e ., the azimuth is 0?), and always at the same altitude ( angle from the horizon ), equal to the latitude of the point of observation on Earth.
26.
Symonds & Russell subsequently warn that it is an error to assume an individual has emerged from PTA based on his or her apparent sound awareness and memory at one particular point of observation; an error which may result in underestimating PTA duration.
27.
In his " Catoptrica ", Hero of Alexandria showed by a geometrical method that the actual path taken by a ray of light reflected from a plane mirror is shorter than any other reflected path that might be drawn between the source and point of observation.
28.
Among the devices used for astronomy was gnomon, known as " Sanku ", in which the shadow of a vertical rod is applied on a horizontal plane in order to ascertain the cardinal directions, the latitude of the point of observation, and the time of observation.
29.
The site chosen for the foundation of the " castra ", which might seem unsuitable due to the steep slope of the terrain, was actually an excellent position with a panoramic view-ideal for the point of observation of the Ager Romanus which the camp was to be.
30.
Fermat's principle is the main principle of quantum electrodynamics which states that any particle ( e . g . a photon or an electron ) propagates over all available, unobstructed paths and that the interference, or superposition, of its wavefunction over all those paths at the point of observation gives the probability of detecting the particle at this point.
