O atskiros strukturines dalys, erdves ir ju mastelio charakteristika turejo subtilia simboline prasme: apside
simbolizavo Kristaus galva, joje paprastai budavo irengiami kreslai kunigams ir vyskupams, choro vieta plano atzvilgiu simboliskai atspindejo Kristaus burnos vieta, is cia vienuoliu chorai giedodavo choralus.
Modern mathematicians recognize this eighteenth-century wonder worker with 21 papers on such diverse topics as Euler's work from 1750 to 1760, his fourteen most significant problems, his archives, his proof, with Bernoulli, of the fundamental theory of algebra, and his work on the quadrature of lunes, the Basel problem, elliptic integrals, harmonic progressions, power series expansions of the logarithmic and exponential functions, the summation formula, combinatories, the partition function, parallels with Clausen, the motion of the lunar apsides
, elastic curves, the advection equation, the propulsion of ships and the creation of accurate maps.
Thus, the oblateness of a planet causes apsides
of particle orbits in and near the equatorial plane to precess in the direction of the orbit and lines of nodes of nearly equatorial orbits to regress.
The observed motion of the line of apsides
in numerous eclipse binaries can be explained, in numerous cases, by their elliptic form.
ESTIMATING THE ECCENTRICITY OF THE EARTH'S ORBIT FROM THE DATES OF THE EQUINOXES, SOLSTICES AND APSIDES
Angulo medido en el plano ANOMALY orbital desde la linea de apsides
hasta el radio vector del satelite.
In planets the latter motion is called precession of perihelion; in stars it is either precession of periastron or precession of apsides