equatorial plane


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equatorial plane

See equator.

equatorial plane

[‚e·kwə′tȯr·ē·əl ′plān]
(astronomy)
The plane passing through the equator of the earth, or of another celestial body, perpendicular to its axis of rotation and equidistant from its poles.
(cell and molecular biology)
The plane in a cell undergoing mitosis that is midway between the centrosomes and perpendicular to the spindle fibers.
(mechanics)
A plane perpendicular to the axis of rotation of a rotating body and equidistant from the intersections of this axis with the body's surface, provided that the body is symmetric about the axis of rotation and is symmetric under reflection through this plane.
(optics)
References in periodicals archive ?
At metaphase of MT1, chromosomes segregated after aligning on the equatorial plane of each spindle.
Prophase II--spindles form and chromosomes begin to move to equatorial plane.
Although the beam may be parallel in the equatorial plane, it will not be parallel in axial plane and axial divergence can be expected in both the incident and diffracted beams.
When it is established that the micrograph shows two spherulites, one can see that the voided areas are located essentially in the meridional regions of the spherulites and, to a lesser degree, in the equatorial plane at the edges of the spherulite.
The longitudinal protrusions are arranged in first and second rows extending from the first and second side walls toward and across the equatorial plane of the tire.
Molecular formula-electronic spectra number (b) bands, transitions (a), predicted structure (a rough M-L sketch given), and geometry (a) 1 [[VO(BHFH)Cl].sub.2] 28,006 M-M complex with Cl bridges, 18,270 V=O and two L1 with -O, -O, 13,330 and -N coordination 2 [[VO(BHEH)Cl].sub.2] 25,000 M-M complex with Cl bridges, 14,920 V=O and two L2 with -O, -O, 13,000 and -N coordination 3 [VO(HAEP)[([H.sub.2]O).sub.2]] 25,000 Distorted Oh complex, V=O, two 22,200 -O[H.sub.2], and L3 with -N, 13,560 -O, and -S coordination on the equatorial plane 2B2-2A1 2B2-2B1 2B2-2E Correspond to Oh symmetry with tetragonal distortion.
S/2004 N 1 appears to travel in a near-circular orbit very close to Neptune's equatorial plane. Based on its recorded positions, it circles the planet every 22.47 hours, meaning it orbits about 105,000 km from Neptune's center.
"Ultra-relativistic particles move very fast and cannot be at the right frequency with waves when they are close to the equatorial plane," said Ksenia Orlova, a UCLA postdoctoral scholar in Shprits' group who is funded by NASA's Jack Eddy Fellowship.
As a first step we consider the convergence properties of R and the symmetry properties of T with respect to the equatorial plane [theta] = [pi]/2.
But sunlight has been creeping up Titan's northern hemisphere since August 2009, when the Sun's light crossed the equatorial plane at equinox.
But the Earth's shape is roughly an ellipsoid, a fact that causes an extra complication: the angle of incidence of the lunar shadow with regard to the equatorial plane.