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What (who) is cylindrical block - definition

MAP PROJECTION

Miller projection; Miller cylindrical; Miller Cylindrical; World Miller Cylindrical; Miller cylindrical map projection

Block (permutation group theory)

TERM IN MATHEMATICS AND GROUP THEORY

Block system

In mathematics and group theory, a block system for the action of a group G on a set X is a partition of X that is G-invariant. In terms of the associated equivalence relation on X, G-invariance means that

https://en.wikipedia.org/wiki/Block_(permutation_group_theory)

block system

TERM IN MATHEMATICS AND GROUP THEORY

Block system

¦ noun a system of railway signalling which divides the track into sections and allows no train to enter a section that is not completely clear.

Block system

TERM IN MATHEMATICS AND GROUP THEORY

Block system

·add. ·- A system by which the track is divided into short sections, as of three or four miles, and trains are so run by the guidance of electric, or combined electric and pneumatic, signals that no train enters a section or block until the preceding train has left it, as in absolute blocking, or that a train may be allowed to follow another into a block as long as it proceeds with excessive caution, as in permissive blocking.

Wikipedia

Miller cylindrical projection

The Miller cylindrical projection is a modified Mercator projection, proposed by Osborn Maitland Miller in 1942. The latitude is scaled by a factor of 4⁄5, projected according to Mercator, and then the result is multiplied by 5⁄4 to retain scale along the equator. Hence:

or inversely,

where λ is the longitude from the central meridian of the projection, and φ is the latitude. Meridians are thus about 0.733 the length of the equator.

In GIS applications, this projection is known as: "ESRI:54003 – World Miller Cylindrical".

Compact Miller projection is similar to Miller but spacing between parallels stops growing after 55 degrees.

https://en.wikipedia.org/wiki/Miller cylindrical projection