Caelo

Caelo

What to photograph tonight

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Released
October 12, 2026
Updated
November 2, 2026

Features

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About

Your sky's quiet lookout — honest, even when it's "not tonight." Caelo knows your sky because you mapped it: the trees, the fence line, the roof next door, whatever actually stands between you and a clear shot of the night sky. Caelo Pro puts that horizon to work everywhere it matters. Open your Observing Plan and every recommendation already accounts for your yard. Not a generic transit time off a star chart, but the real window: when a target clears your roof, and when it drops behind next door's oak tree. A flat-horizon planner can't do that. Pro plans your night, not a generic one. Pro also shows you further ahead: This Week lays out seven nights of visibility at a glance, and This Year shows the whole season a target climbs through your sky, so you can plan around months instead of guessing at them. Caelo would rather tell you "not tonight" than send you out for nothing.
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What's New in Caelo

1.1.0

November 2, 2026

Caelo now supports Widgets! - Add Caelo to your home screen or lock screen. Caelo Pro shows the Tonight verdict (small) and This Week (medium). Caelo now has support for the Milky Way as a special object type. With a Sky Profile, Tonight will show you whether the Milky Way's core is up in the dark, or what may be in the way when it isn't. A new Milky Way detail view lets you slide through the night to see when the Milky Way core and band are visible from your backyard. Explore view starts on what's visible tonight. Switch to All objects to show the rest. Filters have moved to a new standard UI. Any filters you apply will show up as chips, and you tap a chip to remove it. Caelo's catalog of objects will now show you which objects will look small (or large!) based on your telescope without needing to go into the object's detail view. Caelo allows you to configure the faintest target you're interested in (per Location) and Tonight and Explore will hide anything fainter. No more being tempted by faint targets. Settings also introduces "Hide small targets" which will no longer show any small targets (based on your telescope) from Tonight or Explore. It needs a scope that reports its pixel size. The 7-Day Outlook now indicates more clearly which nights forecasts are firm versus indications only. The first three nights are a forecast, and the next four are more indicative than a forecast. Sky plots can now automatically rotate to the way you're facing. Settings has a new Send Diagnostics option. If something isn't working right for you, Caelo puts together a file to send to me (it will show you all of it) and opens an email (or the share sheet) you can send yourself. Nothing is sent automatically. Settings also has a Tip Jar with three optional tips you can generously contribute. A tip does not change what Caelo does, but does make me feel warm and fuzzy inside! (thanks in advance)

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Subscriptions & In-App Purchases

$0.99

Small Tip

A fleeting flash — bright while it lasts