A Round Earth and a Roof That Guards It

Stand in an open field and turn around slowly.

Flat. Obviously flat. The ground runs off to a straight edge in every direction and stops. Your eyes are not lying to you exactly, they are just working at a scale far too small to catch the curve.

So you cannot really blame the ancients. For most of human history, almost everybody believed the earth was flat, and a flat earth is a perfectly sensible thing to believe if all you have is a field and a pair of eyes. It took until 1577, when Sir Francis Drake sailed all the way around and came back to where he started, for the argument to be properly finished.

Now here is a verse from chapter 31, verse 29.

It says that Allah merges the night into the day, and merges the day into the night.

Read it slowly, because the important word is merges.

Why merging is the giveaway

Think about what happens when the sun goes down where you live.

Does the light switch off? Does somebody flip a lever and the day becomes night in one clean cut?

No. It slides. There is that long stretch where the sky goes orange, then dusty pink, then a deep blue you cannot name, and then finally dark, and you cannot point at the second it happened. In the morning it runs in reverse. Day seeps into night and night seeps into day, slowly, like one colour of paint bleeding into another.

That only happens on a sphere.

On a flat earth, with a light source above it, you would get a hard edge. Light, then dark. Clean line. The reason you get a smooth merge instead is that the ground is curved, so the sunlight arrives at a slant and creeps across the surface bit by bit.

Chapter 39, verse 5 makes it even more physical. It uses the verb yukawwiru, which comes from the root kawwara. That root means to coil something around, to wrap it, the way you wind a turban around your head in overlapping layers.

The night is wrapped around the day. The day is wrapped around the night.

You cannot wrap anything around a flat plate. Wrapping needs a ball.

The egg of an ostrich

The Qur’an then does something that goes past round.

Chapter 79, verse 30 says that after this, Allah spread out the earth, and the word it uses is dahaha.

Translators usually write “spread out”, which is fair enough, because that is the plain meaning. But Arabic words carry their whole family with them, and daha comes from a root connected to duhiya, which means the egg of an ostrich.

Why an ostrich egg and not a chicken egg? Because they are not the same shape. A chicken egg is pointy at one end. An ostrich egg is rounder, and it is noticeably flattened at the two ends and bulging around the middle.

Now look up the actual shape of the earth.

It is not a perfect sphere. It is slightly squashed at the North and South Poles and slightly fatter around the equator, because it spins. Geographers have a word for this exact shape. They call it a geoid, and if you want the simplest picture of a geoid in everyday life, the honest answer is an ostrich egg.

Not round. Round-with-a-squash. The word was sitting in the verse the whole time.

The roof you never think about

Now stop looking down and look up.

Chapter 21, verse 32 says that Allah made the sky a protected ceiling, and that people turn away from its signs.

A ceiling makes sense as a description. It is above you. But protected? Protecting you from what? The sky looks like nothing. It looks like a large blue empty.

It is not empty, and it is not idle.

The air above your head is stacked in layers, and those layers spend every second of every day taking hits on your behalf.

Ultraviolet rays come in from the sun and would wreck living tissue at full strength. The ozone layer absorbs most of them before they get near you. X-rays and harder radiation pour in from deep space and get stopped higher up. Charged particles streaming off the sun get bent away by the earth’s magnetic field, and when some of them slip through near the poles they light up as the aurora, which is essentially a shield glowing where it got hit.

And rocks. Tonnes of rock and dust fall toward the earth every single day. Nearly all of it burns up in the atmosphere from sheer friction. What you call a shooting star is a stone being destroyed a hundred kilometres above your head, and that is the ceiling doing its job.

Take the atmosphere away and life on the surface ends. Not slowly. It ends.

Two things at once

Here is what gets me about that verse.

It does not only say the sky is a roof, which anyone could guess by looking. It says the roof is guarded, which nobody could guess by looking, because the guarding is invisible and the thing being blocked is invisible too.

You have lived your whole life underneath a shield, and you have never once felt it working.

The Qur’an mentions it, then adds a small complaint. People turn away from its signs. They look straight up at it and see blue.