There are only six modern Celtic languages, they are Welsh, Cornish, Breton, Irish, Manx, and Scottish Gaelic.
As you can see Greek is not included in the modern Celtic languages, so Greek is not a Celtic language.
In this excerpt by “the fleet” is referred to the Greek army
lead. The Greek army is lead by Agamemnon, who. by destroying the temple of Apollo and ravishing Trojan priest’s
daughter, Chryseis, draws on the wrath of Apollo. Apollo sets off the plague
and infects Greek fleet to punish him. By releasing captives, Agamemnon saves his army from the
plague and marches on ahead.
They are two ratios that express the same relationship between numbers.