JMNT(i)
29 "Now immediately after the pressure (constriction; tribulation) of those [particular] days, ‘the sun will be progressively made dark and the moon will not continue giving its (or: her) diffused radiance,’ [Isa. 13:10; Ezk. 32:7; Joel 2:10] and then the stars will, one after another, be falling from the sky (or: heaven) – ‘and so, the powers and abilities of the heavens will be progressively shaken (agitated; stirred up; made to rock so as to be ready to fall).’ [Isa. 34:4; Hag. 2:6, 21]
30 "And at that time, the 'sign' which is the Son of the Man (= Adam's son; the son who has the [true] character and qualities of humanity; or: = the expected Messianic figure; the Human Being) will be made progressively visible (be brought to light and made to shine), in union with heaven (or: within the midst of [the] atmosphere), and at that point ‘all the tribes of the land (or: earth) will continue beating themselves (= a figure of striking one's breast in grief and remorse; or: as when grain is being threshed; or: give themselves to wearisome toil; or: cut themselves off, as when harvesting grain),’ [Zech. 12:10, 14] and they will proceed in seeing for themselves ‘the Son of the Man progressively coming upon the clouds of the atmosphere (or: sky),’ [Dan. 7:13-14] with power and ability, as well as much glory (= many manifestations which call forth praise; an extensive good reputation).