Get ready to view the next Sun and Moon eclipses! EclipseCalculator & Calendar.

Computation of solar time and simple solar ephemeris for gnomonist

Measure and record specific times, locations and movement of theSun and stars.

AstroCalendar - Calendar of astronomical and stargazing events

DSO Planner Plus is an astronomy observationplanning tool with excellent star charting capabilities made byactive and experienced amateur observers with a passion for visualobservations. It has large integrated deep sky objects databasesand star catalogs, and provides an opportunity to create any numberof user own object databases. The application excels at creatingobservation plans on the fly, has powerful note takingcapabilities, PushTo and GoTo support and night (red) mode.Consider Pro Edition if you need more stars/PGC objects.Before installation please make sure that you have at least 540MBof free space on your internal SD card to download applicationdatabases! (Note: due to Google Play rules this data cannot bemoved to your external SD card - you must have 540MB free on yourinternal SD card!)+ Star catalogs. USNO UCAC4 (full star coverage to 14m, 15.4 mnstars), Tycho-2 (2.5 mn stars), Yale bright star catalog (9 000stars)+ Deep sky catalogs. NgcIc (12 000 objects including Messier,Caldwell and Herschel 400 objects), SAC (Saguaro Astronomy Clubdatabase, 10 000 objects), UGC (13 000 objects), Lynds dark andbright nebula (3 000 objects), Barnard dark nebula (350 objects),SH2 (300 objects), PK (1 500 planetary nebula), Abell cluster ofgalaxies (2 700 objects), Hickson Compact Group (100 objects), PGC(153 000 galaxies to 16.7m)+ Double Star catalog. Brightest Double Stars (2 300 stars),Washington Double Star Catalog (120 000 stars), double stars fromYale catalog. Info Panel with PA and separation for eachcomponent.+ Comet support. Orbital elements of around 700 observable cometscould be automatically updated via internet+ Minor planet support. Database of 10 000 brightest minorplanets+ Famous Steve Gottlieb Notes attached to NGCIC objects+ Custom catalogs. Unlimited capability to create fully searchableown catalogs+ Cross-match names database. Search objects by less commonnames+ DSS imagery support. Download DSS images of any sky portion intooffline cache and overlay it on the star chart+ Offline images. Integrated set of images of most NgcIc objects,opportunity to add own images when creating custom catalogs+ Nebula contours. Contours of famous nebulae+ Object contours. Ellipse in real dimension and orientation+ Night mode. Fully red screen with red keyboard and menus+ PushTo for dobsonian mounts with setting circles. Level yourdobsonian mount and perform one star alignment. The app willautomatically recalculate az/alt numbers to easily hunt theobject+ GoTo for Meade and Celestron controllers with bluetoothdongle+ Unique visibility tool. Only objects that are visible withselected equipment in the current sky conditions could be shown onthe Star Chart (for objects from NGCIC/SAC/PGC catalogs)+ Planning tool. Filter any objects database by observer location,sky condition, astronomical equipment, time range of observationand object features (type, dimension, magnitude, minimal altitude,visibility and other fields of own custom catalogs). Removeduplicate objects when searching in intersecting databases. Createup to 4 observation lists. Easily track observed and remaining tobe observed objects with note taking tool+ Import tool. Import observation lists in Sky Safari and Sky Toolsformat. Use pre-compiled Night Sky Observer Guide observationlists.+ Note taking. Take text and/or audio notes+ Observing places. GPS, manual coordinates, custom lists. Databasewith 24 000 cities worldwide+ Equipment. Keep track of all your telescopes and eyepieces. Usethem for object visibility calculation and star charting. Use 500popular eyepieces database+ Twilight calculator. Calculation of the full darkness for acurrent night and for a month ahead.+ 2 visual themes (bright and dark)+ Powerful share/export/import capabilities (of databases,observation lists, notes)Disclaimer

A simple map of the sky that shows the positions of the sun, moonand planets.

Tool to show current HF propagation prediction.

Universal astronomy ephemeris App for calculating high precisionephemeris

One- or two-semester introductory astronomy courses.

Mobile Observatory is the perfect tool foranybody interested in the sky's wonders, from the occasional skygazer to the passionate amateur astronomer.Do you want to know if the next lunar eclipse is visible from yourlocation or when the next bright comet is visible? Would you liketo be notified by your smart phone next time, Jupiter and the Moonmeet in the sky? Do you want to know what the blazing bright objectin the evening sky is? Do you want to be always up-to-date whichcelestial events that are visible from your location? Then this appis a must-have for you!Mobile Observatory does not only include a live, zoomable sky mapwhich tells you what sky object you are looking at but provides youwith loads of detailed extra information on stars, planets, deepsky objects, meteor showers, comets, asteroids, lunar and solareclipses as well as detailed ephemeris of all included sky objectsand an interactive top-down view of the Solar System. All that injust one app!Main Features- Zoomable sky map showing stars, planets, asteroids, and more(above and below the horizon)- Interactive top-down view of the Solar System- Live mode (point device on sky and get information on what yousee)- Calendar showing detailed descriptions of celestial events- Push celestial events to your phone's calendar and set a reminderalarm- Rise, set, and transit times for any object- Position of any object in the sky (altitude and direction)- Twilight times, length of day- Bright Star Catalog (~9000 stars) with detailed information- More than 400 000 additional stars from the PPM Star Catalog(Android 3.1 or higher required)- 2500 selected NGC objects (galaxies, clusters, ...)- Messier Catalog (110 objects) complete with images- Caldwell Catalog (110 objects) complete with images- Hidden Treasures Catalog (109 objects) complete with images- Meteor streams (begin, maximum, hourly rate, ...)- Lunar and solar eclipses information- Lunar librations, ascending node, maximum declination- Bright comets (automatically selected according to thedate)- Dwarf planets: The five known dwarf planets- Minor planets: bright, near Earth, trans-Neptune (more than 10000in the database)- Update database online: download up-to-date orbital elements ofcomets and minor planets- Moon phases, the apparent view of the sun and planets- Current image of the Sun and sunspot number- Automatically generated visibility report for any object- Simulation of light pollution- Intuitive User Interface: quickly find what you are lookingfor- Widget with rise & set times of the Sun and Moon- Maintain your favorite locations in a list- Automatic location determination from the mobile network orGPS- Select a location from a built-in database or online via GoogleMaps- 400 observatory locations- Choose any time and date- Detailed ephemeris, visibility information of all objects- Dates of conjunctions between any object with planets or theMoon- 3D-view of the Moon and the planets- Accurate calculations for dates between 1900 and 2100

Information about the Sun and tools for building and understandingsundials.