How to Photograph the Moon Rising Behind a Landmark

You have seen the photograph: an enormous moon rising directly behind a bridge, a lighthouse, a cathedral. It looks like a composite. Most of the good ones are not. They are the result of someone working out, in advance, exactly where to stand.

Three things have to be true at the same moment: the moon has to be at the right compass bearing, at the right height, and you have to be far enough away. Get all three and the shot is close to guaranteed. Miss one and there is no recovering it on the night.

Distance is what makes the moon big

This is the counterintuitive part, and it is the one that separates the photographs that work from the ones that do not.

The moon is always about half a degree across. Nothing you do changes that. What changes is how big your foreground is in angular terms — and that depends entirely on how far away from it you stand.

Stand 200 metres from a 20-metre lighthouse and it spans about 6° of your view, twelve times the moon. The moon will look like a coin next to it. Walk back to 2.3 kilometres and that same lighthouse spans about half a degree — the same as the moon. Now they are the same size in frame, and you need a long lens to make both large.

So the rule is simple and it is the opposite of what instinct says: to make the moon look enormous, get further away and use a longer lens. Photographers new to this walk closer, put on a wide lens, and end up with a pea in the sky.

A quick way to size it up: divide your subject's height in metres by 0.0087 to get the distance in metres at which it matches the moon. A 30-metre tower matches the moon at about 3.4km. Half that distance and the tower is twice the moon's size, which is often the more pleasing ratio.

Bearing is what makes it line up

Distance decides the size. Bearing decides whether it happens at all.

Unlike the sun, the moon's rise bearing swings widely from night to night — it can move by several degrees a day, and across a month it sweeps through a large arc of the horizon. So "the moon rises in the east" is not usable information. You need the bearing on a specific date, and then you need to place yourself on the line that runs from your subject out along that bearing.

That line is where the alignment planner comes in. You give it the landmark and it searches for the dates and minutes when the sun or moon lines up behind it from where you plan to stand — which is the whole problem, solved in the direction you actually need it. Rather than asking "where will the moon be tonight", it answers "when will the moon be there".

Move a couple of hundred metres along the line and the alignment still holds, but the size ratio changes. That is your compositional control.

Height decides how much foreground you keep

A moon photographed 20° up is a moon against a black sky. The photographs people respond to are almost always shot within a few degrees of the horizon, and that is not only aesthetics.

Near the horizon you are looking through much more atmosphere. That dims the moon by a couple of stops, warms it to orange, and flattens it visibly. The dimming is the useful part: the full moon is a sunlit rock and is normally several stops brighter than a twilight landscape, which is why so many attempts come out as a white disc over a black silhouette. Low down, the gap narrows enough that a single exposure can hold both.

Which is why the shot to plan for is the full moon rising at sunset. The moon is opposite the sun, so it rises as the sun sets, and for twenty or thirty minutes the sky is bright enough to balance it. That window is short, and it is the reason to arrive early.

Settings to start from

The full moon is lit by the same sun you are standing under, so it meters like a sunlit subject, not a night subject. The starting point is the "looney 11" rule: f/11, ISO 100, shutter 1/100 — the lunar equivalent of sunny 16.

From there:

• Low on the horizon, open up by one to two stops for the atmospheric dimming.
• Shoot raw and bracket. The balance between moon and foreground shifts by the minute as the sky darkens.
• Watch your shutter. The moon moves its own diameter in about two minutes, and on a long lens that shows. At 400mm keep it well under a second.
• Focus manually on the moon's limb and leave it. Autofocus hunts on a bright disc in a dark field.

Do the scouting the day before

Alignments are unforgiving — the good ones last under a minute, and there is no second attempt that month. So separate the planning from the shooting.

Find the date and the standing position first. Then go to the spot in daylight, open AR Sky View, and scrub time forward to the moment: it will draw the moon on the actual scene so you can confirm the tower really is where the bearing says it is, and that nothing you did not think about — a crane, a line of trees — is sitting in the gap.

Then all that is left is arriving twenty minutes early with the lens already on.