apex

• The highest point (of something) (synset 108695539)
  hypernym: extreme, extreme point, extremum - the point located farthest from the middle of something
  hyponym:

  • crown - the part of a hat (the vertex) that covers the crown of the head
  • roof peak - the highest point of a roof
  synonym: acme, peak, vertex
• The point on the celestial sphere toward which the sun and solar system appear to be moving relative to the fixed stars (synset 108511997)
  hypernym: celestial point - a point in the heavens (on the celestial sphere)
  part meronym: celestial sphere, empyrean, firmament, heavens, sphere, vault of heaven, welkin - the apparent surface of the imaginary sphere on which celestial bodies appear to be projected
  synonym: apex of the sun's way, solar apex

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