1 is a planetarium and telescope control program capable of simulating most of the phenomenon of the Earth's sky. Designed for the demanding requirements of an observing amateur astronomer, it also provides extraordinary accuracy as a planetarium program for the "armchair" astronomer or any other person interested in learning about astronomy.Known for its ease of use, rich feature set, high-accuracy, and lightning fast speed.

Includes extensive databases such as the Hubble Guide Star Catalog; the detailed, amateur oriented, SAC deep sky database; the huge Principle Galaxy Catalog; the General Catalog of Variable Stars; the Washington Visual Double Star catalog; a dedicated planetary nebulae database; the Sun and Moon; the planets; 700,000+ asteroids (ed from Lowell Observatory); and add your own comets, asteroids and tens of thousands of your own objects too.

Comprehensive control of most computerized telescopes on the market (even many discontinued ones too). Interfaces to many telescopes and mounts natively, but also supports the ASCOM Inititive's telescope and focuser "drivers".

High quality printed star charts.

Written by an observer for observers.

Written by a CCD imager for imagers.

Powerful animation mode.

A large detailed up-to-date User's Manual with context sensitive help.

The Yale Bright Star Catalog (9,100 stars to magnitude 6.5) - included are many "common" names for the bright stars

The SAO Star Catalog (about 250,000 stars to magnitude 9.5)

The Tycho-2 Star Catalog (about 2,500,000 stars to magnitude 12-13)

The Hubble Guide Star Catalog (about 15,000,000 stars to an average magnitude of about 14)

Support is provided to read the US Naval Observatories A-2.0 (~500,000,000 stars!) and SA-2.0 (~50,000,000 stars)

The Saguaro Astronomy Club deep sky database (V8.1) which contains 10,342 objects of all types, including of course the Messier Catalog

The Principle Galaxy Catalog (2002 edition - about 1 million galaxies)

The General Catalog of Variable Stars (September 2015 version - 52,011 stars)

The Washington Visual Double Star Catalog (2016Mar25 version - 135,098 pairs of stars)

The Wallace-SEC galactic planetary nebulae database (V7 - 1143 objects)

The Lowell Minor Planet Database (over 700,000 minor planets). This database is updated from within ECU over the Internet.

Enter the orbital elements for up to 10,000 comets and minor planets (asteroids) (comets and asteroids can be automatically ed from within ECU from the International Astronomical Union's Minor Planet Center)

The eight planets (and Pluto!), the Sun, Anti-Sun, and the Moon

Add up to 50,000 of your own objects

ECU is lightning fast compared to many other astronomy programs and runs very well on older computers that you might use in the field (e.g. older laptops).

ECU is very easy to use. Most operations are performed with the mouse. A "toolbar" is provided for most common functions and for those who prefer to use the keyboard, there are many hot-keys.

The sky can be drawn as either in Sky Atlas (north is up) mode, Local Horizon (up in the local sky is up) mode or with the sky rotated at any arbitrary angle.

It exhibits a colorful display - the colors of all screen elements are controllable by user. Fonts can also be set.

High quality star charts can be printed (in black and white and in full color) which are highly customizable by the user including titles, legend, fonts, and border dimensions. You can also print two charts per page at different zoom levels.

ECU status displays include the local , universal , latitude and loude, RA/DEC, AZ/ALT, field size, magnitude limits, sky darkness, hour angle, sidereal , and Julian date.

Stars can be drawn in color based on either their spectral type or B-V color index.

Deep sky objects are drawn their correct size, shape, and orientation (when this information is included in the database).

There is advanced control over magnitude limits for all types of objects.

Clicking on an object causes an information box to pop up. All objects provide their RA, DEC, azimuth, altitude, rise and set s, magnitude (if known), air mass, extinction, galactic latitude, and galactic loude. Other information provided is as follows:

The Sun: distance in AU, kilometers, and light travel ; angular size; solar loude

The Moon: distance in kilometers; angular size; phase angle; phase age in days; its illuminated fraction in percent

The planets: distance in AU, kilometers, and light travel ; angular size; phase; rates of motion; ecliptic latitude and loude

Comets and asteroids: distance to the Sun and the Earth in AU, kilometers, and light travel ; solar elongation; phase (for asteroids); rates of motion; ecliptic latitude and loude

Yale stars: Yale number; HD number; SAO number; Flamsteed/Bayer designation, color (B-V); spectral type; proper motion

SAO stars: SAO number; spectral type

Tycho-2 stars (when information is available): Tycho-2 number, Hipparcos number, HD number, magnitude (B and V), proper motion, and parallax (with error estimate)

Hubble Guide Stars: GSC catalog number; estimated position error; magnitude band; Plate ID

SAC deep sky objects: a varying amount of information, but usually their name (and alternate name); Dreyer description, angular size; position angle; object class; notes

PGC galaxies: the primary and up to four other names; morphological type; angular size; position angle; object class; radial velocity; implied distance in light years

Variable stars: minimum and maximum magnitude; designation; type of variability; period; rising (or duration of eclipse); of previous maximum

Double stars: combined magnitude of the pair; discoverer code; DM number; magnitudes of both stars; separation and position angle at up to two dates; spectral type

User objects: user number; text description

The user can display up to 50 images of an object.

The user can add observing notes about any object.

The user can measure angular distances and position angles on the sky with the mouse. Several angular formats are provided.

All user settings can be saved to named configuration files for later retrieval. Comet and asteroid elements can be saved to or loaded from separate ASCII files.

The can be set as local mean , UTC, Julian Date, or from the computer's clock (local or UTC). Dates can be entered from 4713BC to 9999AD. For Canada, US and Europe Daylight Saving can be automatically set.

The observer's location is entered by latitude and loude or from a list of cities (add your own, too).

Sync your and/or location using a GPS receiver.

The effects of observer's parallax, nutation, precession, light travel , aberration, and atmospheric refraction can be individually controlled.

The sky can be displayed as white on black or black on white, or, of course, in full color. Special "night vision" modes protect your night vision when ECU is used in an observatory.

ECU displays the horizon line, custom horizon lines set to match your observing sites, ecliptic line, meridian line, RA/DEC grid (auto scaling), Local Horizon grid (auto scaling), constellation lines, boundary lines, galactic equator line, etc.

Extensive text labels are provided for all types of objects. Text labels can be intelligently placed to avoid overlap.

Several field "targets" of programmable angular size, including rotatable rectangles, can be drawn to represent the field of view of your main telescope and finder scope respectively. You can place up to 100 of these "targets" anywhere on the sky.

The user can center the display at any RA/DEC, AZ/ALT, Hour Angle/DEC, bright star, constellations, Messier object, named deep sky object, point on the horizon (north, south, etc.), or solar system object.

The object databases can also be extensively searched.

Powerful tools to search and filter comet and asteroid elements by brightness, sky position, visibility, Earth distance, etc.

Create detailed reports (that you can import into a spreadsheet or database program such as Excel) of objects plotted on the screen or on printed charts.

ECU's animation mode allows increments from 1 second to four years. The display can be "locked" to the Sun, Moon, a planet, a comet or asteroid, an AZ/ALT or an RA/DEC. Trails of objects with labels can be drawn.

A dialog box to display the rise/set s of the Sun and Moon on the current day is provided. It also shows the s of civil, nautical, astronomical twilight, the phase of the Moon, the length of the day and night, and the length of nautical and astronomical darkness.

New Miscellaneous Features:

Configuration files from versions 3.0, 3.1, 3.2, 4.0, 5.0, and 6.0 of ECU are automatically read and converted to V6.1 format. This operation is totally transparent

Settings for Atmospheric Pressure and Temperature have been added - they affect the refraction calculation

The Geographic Location dialog box can

show the current location on a Google Map

allow entering of latitude and loude by either decimal degrees or degrees and minutes

Some repetitive calculations have been parallelized so will take advantage of multiple or multi-core processors

The system colours (used for the night vision mode) can no longer be changed - newer versions of windows do not allow it

The colours of the lines and text on the Status Line can now be set

The day of the week is now displayed in the Sun and Moon Data dialog box

The Directory/File/Web Setup dialog box:

Browse buttons were added to make the setting of files and directories much easier

now has buttons to show ECU's Documents and AppData directories (where it stores files)

User object files are now separated by a semi-colon and are easily selected using a file browser

In the Identify Object dialog box, the object's Hour Angle is now displayed

The Field menu is now called the Chart menu

Field Targets are now called Chart Targets

Changes have been made to some of the keyboard short-cuts

Left clicking on the Status Line now enables/disables the scroll bars (instead of showing/hiding the Status box)

Loading a new configuration file (for ASCOM type telescopes) no longer disables the telescope interface

Features related to loadiemoving the Hubble Guide Star catalog are removed - now handled by the program installer

The Hubble constant, used to estimate galaxy distances, has been reduced to 70.

In the Enter dialog box the Sun and Moon rise and set buttons now use the date specified rather than only the current date.

Bug Fixes:

SEC planetary nebulae were drawn when "Only Messiers" was enabled

Fixed a bug related to saving orbit files

It now does more database checks on start up and if problems are detected more useful error messages are displayed

fix Hipparcos star searching - the last star in each block was missed

fix formatting of variable star data in Identify Dialog and Object Reports

Correct messaging for maximum and minimum brightness of variable star predictions (previously it reported maximum when eclipsing binaries were actually minimums)

fix Track Telescope bug

fix/improve telescope field-of-view plotting

fix the missing default Chart Target rectangles



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