P
polytardic
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(afar stars which don't move) μακροαστρικός
The etymon isn't tautological to the definition.
Sidereal means macro-astral, because it's used in calculations of time, so only the afar stars are used as reference.
Latin sīdereus, from sīdus (“star”)
Etymology[edit]
Compare Ancient Greek σίδηρος (sídēros). Some derive this from Proto-Indo-European *sweid-, whence Latin sūdor, Greek ἱδρώς (hidrṓs), English sweat.
The etymon isn't tautological to the definition.
Sidereal means macro-astral, because it's used in calculations of time, so only the afar stars are used as reference.
Latin sīdereus, from sīdus (“star”)
Etymology[edit]
Compare Ancient Greek σίδηρος (sídēros). Some derive this from Proto-Indo-European *sweid-, whence Latin sūdor, Greek ἱδρώς (hidrṓs), English sweat.
