The largest optical telescopes on earth can distinguish between things that are separated by about one second of arc (a 1, 296, 000th of the celestial equator).

ECONOMIST: Pulsars: In a wink | The

Its resolution is 30 billionths of a second of arc.

ECONOMIST: Pulsars: In a wink | The

With Dieng on the bench, Southerland, who had just one basket in the first half, then drained a 3 from the top of the arc to give Syracuse just its second lead of the game.

WSJ: No. 10 Louisville beats No. 12 Syracuse 58-53

That would give it a resolution of a few thousandths of an arc-second enough, were this an optical rather than a radio telescope, to see a boulder just a few metres across on the surface of the moon.

ECONOMIST: Radio telescopes

It was 31-23 after one, and Detroit went 6 of 9 from beyond the arc in the second.

WSJ: Spurs' streak ends in 119-109 loss to Pistons

The second reason this book needs three movies is that a trilogy better mirrors the narrative arc of the book.

FORBES: Connect

Chelsea in the second half against reading, with Lampard in the holding midfield place, and the arc of mata, torres, hazard, sturridge and bertrand showed Chelsea can be very dangerous offensively.

FORBES: Will Premier League First Impressions Be Lasting?