APT Darkness Clock

2.8

Distinct Solutions Ltd.

5.00

124 reviews

10,000+
Downloads

Free

APT DC calculates the suitable time for deep sky astrophotography.

About APT Darkness Clock

APT Darkness Clock is a tools app developed by Distinct Solutions Ltd..

Download Statistics

APT Darkness Clock has been downloaded 13 thousand times. In the last 30 days, the app was downloaded 31 times.

User Ratings

APT Darkness Clock is rated 5.00 out of 5 stars. The rating is based on 120 ratings.

App Information

APT Darkness Clock is FREE to download. The APK download size is 5.18 MB. The latest version available is 2.8. The last update was on October 28, 2025.

Technical Requirements

APT Darkness Clock requires Android 4.0.3+ or higher. The app has a content rating of Everyone. The app has been available on Google Play January 2018.

Description

APT Darkness Clock (APT DC) is a free app without ads, that calculates the suitable time for deep sky astrophotography or observing in selected night and location. It is a small sub-set of a full featured desktop application named APT - Astro Photography Tool.

APT is like Swiss army knife for your astro imaging sessions. No matter what are imaging with - Canon EOS, Nikon, CCD or CMOS astro camera, APT has the right tool for planning, collimating, aligning, focusing, framing, plate-solving, controlling, imaging, synchronizing, scheduling, analyzing, monitoring and more. You can find additional information about APT at www.astrophotography.app.

To image or observe a faint deep sky objects is needed to use the darkest time of the night. This is the time between the evening astro twilight end, the morning astro twilight beginning and when the Moon is below the horizon. In APT that time is named DSD Time - Deep Sky Darkness Time. If the imaging is through narrow band filters, the Moon is less significant factor and important is the time between the astro twilights. This time is named NB Time - Narrow Band Time.

The purpose of APT DC is to calculate what is the DSD / NB Time duration and when these times starts/ends for selected night and location. It is possible to use the current location or one of three other stored observing sites.

For suggestions and support related to APT DC, use the dedicated section of the APT Forum at - http://aptforum.com/phpbb/viewforum.php?f=26

Recent changes:
Google Play compatibility update

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More data about APT Darkness Clock

Price	Free to download
Total downloads	13 thousand
Recent downloads	31
Rating	5.00 based on 120 ratings
Ranking	Not ranked
Version	2.8
APK size	5.17 MB
Number of libraries	25
Designed for Android	4.0.3+
Suitable for	Everyone
Ads	NO ads

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Alternative downloads for the APT Darkness Clock app

APT Darkness Clock compared with similar apps

Common keywords of similar apps

Apt Astro Dc Imaging Darkness Location Named Clock Calculates Suitable Observing Selected Tool Dsd Narrow Band Nb Time Deep Sky Night Astrophotography Twilight Moon

Keywords missing from this app

App Camera Pro Objects Map Astronomy Light Features Sun Planets View Star Stars Mode Images Data Live Stargazing Photography Pollution Celestial Photo Free Dark Real Solar Tonight Hour Exposure Milky Explore Stacking Plan Find Date Comets Perfect Tools Image Calendar Constellations Sunrise Sunset

Google Play Rating history and histogram

Downloads over time

APT Darkness Clock has been downloaded 13 thousand times. Over the past 30 days, it has been downloaded 31 times.

Changelog of APT Darkness Clock

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Developer information for Distinct Solutions Ltd.

Distinct Solutions Ltd.

apt_dc@incanus.biz

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Comments on APT Darkness Clock for Android

★★★★★ Steve Williams · Mar 4, 2020

Great for a quick appraisal the effect the phase of the moon has on an imaging session. Add a dash of common sense to decide whether to lug the equipment out of the shed.

★★★★★ Jeff Hall · Mar 1, 2021

Really condenses the stuff I was looking for before in other programs...twilight end, to moon rise for broadband, NB option...everything in one quick glance. Great! Thanks for this app!

★★★★★ Wayne Williams · May 14, 2024

A good app for me when checking on sunset and sunrise times when doing Astrophotography.

Google Play Rankings for APT Darkness Clock

This app is not ranked

Technologies used by APT Darkness Clock

APT Darkness Clock is requesting 3 permissions and is using 25 libraries.
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