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7780 km — GLONASS orbital altitude
GLONASS satellites orbit at about 19,100 km above Earth. 7780 km is the nominal orbital radius in the medium Earth orbit navigation band.
Science
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778 AD — Roncevaux and the Song of Roland
In 778, Charlemagne's rearguard was destroyed at Roncevaux Pass. From this defeat was born the Song of Roland — the first masterpiece of French literature.
History
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Master number 22 → 4: the builder falls silent
7+7+8+0=22→4. Master Builder ending in zero — a pause after great labour. The number builds something monumental — then retreats into silence.
Numerology