The eclipse; a sign of the end times?
Since eclipses can be calculated down to the very minute of when they shall occur, it is very doubtful that Matthew 24:29 is a reference to just any ordinary eclipse; as no one knows the time of the coming of the Lord (Matt 24:36).
In the Old Testament, we observe an emphasis on astronomical imagery (Gen 1:14) over and over again, as referring to the judgment of specific nations (e.g. Babylon [Isa 13:10]; Edom [Isa 34:4]; Egypt [Ezek 32:7-8]; Israel [Amos 8:9]; Judah [Joel 2:10], et. al.). Since the sign in Matthew 24:29 occurred during "this generation" (Greek, he genea haute) - that is of the original audience (Matt 24:34; Mark 13:30; Luke 21:32; cf. Matt 23:36; Luke 11:50) - proper interpretation dictates that Jesus is using similar 'sun, moon, star' imagery to depict Jerusalem's fall in 70 A.D. (cf. Hag 2:6-9; Heb 12:25-29).
The Bible teaches that we should always be ready for Christ's return (2 Pet 3:11-12; cf. Matt 25:1-13). If we do this, there isn't any need to fixate on the timing of end-times events based upon other phenomenon (cf. Matt 24:23; Mark 13:21; Luke 17:23, etc.).

Dr. Joseph R. Nally, Jr., D.D., M.Div. is the Theological Editor at Third Millennium Ministries (Thirdmill).