T5 moves the ancient markers between TLs 1 through 4. Just a little bit, though. It uses decimals within TL 1 and TL 3 to note interesting stages inside the TL.
Note that the years given are Eurocentric, just as they've been in previous Traveller rules.
TL 0 - Stone age.
TL 1 - Bronze Age [3500 BC]
TL 1.3 - Iron Age [1300 BC]
TL 1.6 - Middle Ages [600 AD]
TL 2 - Age of Sail [1500 AD] - Printing, algebra.
TL 3 - Industrial Revolution [1700 AD] - Calculus, musket, cannon.
TL 3.3 - 1800 AD - Steam
TL 3.6 - 1850 AD - Rail
TL 4 - Mechanization [1900 AD]
TL 5+ appear the same as before.
Note that the years given are Eurocentric, just as they've been in previous Traveller rules.
TL 0 - Stone age.
TL 1 - Bronze Age [3500 BC]
TL 1.3 - Iron Age [1300 BC]
TL 1.6 - Middle Ages [600 AD]
TL 2 - Age of Sail [1500 AD] - Printing, algebra.
TL 3 - Industrial Revolution [1700 AD] - Calculus, musket, cannon.
TL 3.3 - 1800 AD - Steam
TL 3.6 - 1850 AD - Rail
TL 4 - Mechanization [1900 AD]
TL 5+ appear the same as before.