Astronomia na vida cotidiana, histórica e moderna.

Skychart software astronomia

SkyChart is a software to draw chart of the night sky for the amateur astronomer from a bunch of stars and nebulae catalogs. See main web page for full download

Create a custom naked-eye map of the whole sky for any place on Earth, at any time of day or night, on any date from 1600 to 2400. Our Interactive Sky Chart works in most Java-enabled Web browsers. []1

Skychart software download

Download: site:

Skychart software information


This software is part of a full suite for astronomical observation: Requirement: See also:


Change the way the “Show grid” buttons are working.

Add “Show compass” button.

Add distance measurement tool, add “Measure distance” button.

Add chart legend. See menu Chart / Labels

Add option to only show the meridian lines.

Increase planet simulation up to 500 positions, no change for comets and asteroids.

Can change the color for lines and nebulae from the catalog setting.

Add Tirion constellation figures created by James Trogolo

Catalog and data:

New default star catalog based on Extended Hipparcos to replace the BSC and Sky2000.

Add user defined objects in catalog setting.

New online Internet resources:

Add any catalog from Vizier, allow for full or partial download.

Search Simbad, NED, Vizier.

Link object detail to Simbad, NED, HyperLeda.

Projection mapping:

Add Mercator projection.

Cartesian and Mercator projection are rotated to the screen center for full sky coverage.

Change the default projection to Tangent for FOV up to 90 deg. and Mercator for wider fields.

Limit the use of Arc projection to 250 deg. FOV.

Limit the vision of objects below the horizon to 180 deg. FOV.

Coordinates computation:

Improved precision of the apparent coordinates (many thanks to P. Wallace for its help):

Star parallax

Take account of the radial velocity to compute the proper motions.

Light deflection by the Sun.

Extended time validity for nutation and aberration if using DE422.

Compute the precession using “New precession expressions, valid for long time intervals, J. Vondrak, 2011”

Compute DeltaT values from “Five Millennium Canon of Solar Eclipses, Espenak & Meeus, 2006”

Extend the allowed date to +/- 200’000 years

Make a portable installation of Skychart

A portable install mean you install Skychart on a removable media (USB stick) and you can plug it to any PC to run the application without any further configuration.

This require a version more recent than 3.7-2196 to properly handle any change in the media mount point on different computer.

The example is given here for Windows but you can do almost the same on Linux, in this case use the tar installer for an easy setup.

The commands suppose your removable media is mounted on E: change accordingly if it use another letter.

This description use mostly a command line window for the clarity of the explanation but you can also use the equivalent graphical tool.

To open a command line window use the Start menu → Accessories → Command Prompt

1) Create a new folder on your removable media:


mkdir portable_skychart

cd \portable_skychart

2) Copy the program code:

xcopy /S “C:\Program Files\Ciel*” Ciel\

If you not want to install the Skychart software on your computer, see the additional steps below

3) Create a folder for the program configuration:

cd \portable_skychart

mkdir userdata

4) Create a startup script:

cd \portable_skychart

notepad skychart.cmd

Type the following and save the file:

@ECHO off

set basedir=%CD%

start %basedir%\Ciel\skychart.exe –config=”%basedir%\userdata\skychart.ini” –userdir=”%basedir%\userdata”

Now you can plug this USB stick on any (Windows) computer and run the program with a double click on skychart.cmd.