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Find the place and the day · Sunreach Pro

Alignment search: find the days the sun lines up

Manhattanhenge, the sun setting in a mountain notch, the full moon behind a peak: these happen on a few days a year. Pick the point and Sunreach finds the days and the minute, and tells you if the terrain hides it.

Part of Sunreach Pro. Free users see how many windows there are and the first one, blurred.

Sunreach is coming soon to iPhone and iPad; screenshots are from the iOS Simulator, 26–27 October 2026.

The app's Find dates sheet for 42nd Street in Manhattan: recipes on top (Sun in a gap, Sunset over a peak), the skyline strip aimed WNW at 299°, sun and setting chosen, and the next time it lines up: Saturday, 29 May 2027 at 20:12, setting and in sight, with Plan, 3D and Alert me.
Find datesManhattanhenge from 42nd Street: start from what you are after (sun in a gap, sunset over a peak, full moon over a peak), aim WNW 299°, and the next date comes first: 29 May 2027 at 20:12.
NEXT: 28 MAY · 20:12
Pick a notch, a street or a tower and get every day the sun or moon passes through it, to the minute.

What it does

The Find dates sheet has three steps. Where to look: a point on your skyline or a line drawn on the map. Sun or moon: the body, rising or setting, sitting on the skyline or at a height you set, a moon phase filter, and 12 months or 3 years. Dates: each window with its best day and minute, how close it comes and whether it is visible or behind terrain.

Tap a result to open the plan at that minute, 3D to see it at eye level, or Alert me for a reminder before it happens.

How it works

For each day the app follows the sun (or moon) in small steps, finds its closest approach to your target and refines it to under a second. A day counts when the body’s centre passes within 0.5° of the target, about one disc. Days in a row become one window with a best day.

By default the target sits on your terrain skyline, so “setting” means touching the real ridge or street end, not a flat horizon.

How to use it

  1. Open a spot and tap Find dates in the plan (or … > Find dates). You can also touch and hold a point on the skyline chart, or aim at it in 3D eye level.
  2. Under Where to look, drag the ring along the skyline, or switch to Map and drag a line down a street or towards a landmark. Fine-tune with − and +.
  3. Choose Sun or Moon, Rising or Setting, and for the moon a phase such as Full ±1 day.
  4. Read the windows under Dates and tap one to open its day and minute.

Tips

  • For a tower or building top, switch off Sitting on the skyline and set the height instead.
  • Look at the badge: Behind terrain means the line-up happens, but you will not see it from this spot.

Good to know

  • Alignments are geometric. Weather, haze and the exact spot where you stand still decide what you see.