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A new and faithful sky map, created by our Portable Planetariums Digital Team. This cylinder overcomes widely the known in projections inside a dome. This new cylinder projects 2750 stars up to the stellar magnitude 5,45. The stars are showed like they are seen far 200 km of light cities. Besides, six very important stars are presented with his colors: Rigel, Betelgeuse, Antares, Aldebaran, Spica, and Achernar.

The Astronomy is one of the most vast sciences that exist and, at first sight, there can turn out to be tedious the simple perspective to receive operator's training for a Portable Planetarium. Nevertheless, our experience allows us to conclude that an operator can be trainned in a little time, with a set of basic knowledge to manage efficiently a Portable Planetarium.

The above mentioned basic knowledge is: 1. Orientation with the Stars, 2. Basic Constellations, 3. Stars: Birth and Evolution, 4. Big-Bang Notions, 5. Solar System Notions, 6. Universe Notions

Points 1 and 2 can be taken as a whole without fear of being wrong. Basically, we can say that "to be orientated by stars" is to recognize the compass points (North, South, East and Western) with the help of the constellations. To achieve it, we assume that it is necessary to identify and to study the following groups of constellations:

The operator must know that Orión Group is near 180 sexagesimal degrees of the Scorpion Group. Or that when a group is a visible high in the sky, the other is "under our feet" or when one is in the East, the other is in the West Also the operator must know that: these constellation groups define epochs of the year

When in the south hemisphere is visible, high in the sky the Orion Group, beginning the night, is in full summer. If the Scorpion

Gropu is high in the sky, beginning the night, is in full winter.

If to the beginning of the night, Orión Group is towards the West Horizon and Scorpion Groups towards the East Horizon, is an Autumn. If exactly to the inverse, will be spring.

For the Northern Hemispheres is exactly to the inverse of the Southern Hemisphere

We are saying very clair: Orion and Scorpius Groups are easiest constellations, between 88, that any person will identify. The remains are very difficult to identify without something of knowledge.

For the Northern Hemispheres is exactly to the inverse of the Southern Hemisphere

We are saying very clair: Orion and Scorpius Groups are easiest constellations, between 88, that any person will identify.

The remains are very difficult to identify without something of knowledge.

The constellation of Ursa Minor, when including less visible stars which are still visible to the naked eye, vaguely resembles a bear (with an unusually long tail).

In consequence, together with the nearby Ursa Major, it formed the basis of the myth of Callisto. The tail was said to have been lengthened, from that usually expected for a bear, due to the incessant spinning of

the bear, by the tail, around the pole. The variant of the story, in which it is Boötes that represents Arcas, Ursa Minor was considered to represent a dog. This is the older tradition which sensibly explains both the length of the tail and the obsolete alternate name of Cynosura (the dog's tail) for Polaris. (It also clarifies the otherwise inexplicable etymology of "cynosure.")

In even earlier times, Ursa Minor was considered to be just seven close stars, and mythologically was regarded, as such, as sisters. In early Greek mythology, the seven stars in Ursa Minor were considered to be the Hesperides, daughters of Atlas. Together with other constellations in the zodiac sign of Libra (i.e. Boötes, Ursa Major, and Draco) it may have formed the origin of the myth of the apples of the Hesperides, which forms part of the Twelve Labours of Heracles.

To many other cultures Ursa Minor was the Hole in which the earth's axle found its bearing. In Hindu mythology, the Pole Star is Dhruva (the word means pole today) and there is a story behind him becoming a star.

This constellation is said to have been introduced in the 6th century BC by the Greek astronomer Thales of Miletus, but was certainly already used as a guide by sailors.[citation needed]

In ancient times, Ursa Minor was named the Dragon's wing, and was considered a part of Draco. The dragon's wing as an asterism is now long forgotten.[citation needed] Aratus called the constellation ????s???a (Kunosoura) meaning "dog's tail". The name was later adapted to Latin as Cynosura.

Ursa Minor is colloquially known as the Little Dipper because its seven brightest stars seem to form a ladle, or dipper shape. The star at the end of the dipper handle is Polaris, the North Star. Polaris can also be found by following a line through the two stars which form the end of the "bowl" of the Big Dipper, a nearby asterism found in the constellation Ursa Major.

Polaris (a UMi), the brightest star in the constellation, is a yellow supergiant shining at the brightness of 2.02m. It belongs to the rare class of Cepheid variable stars. Only a bit less bright is ß UMi (Kochab), a 2.08m orange giant star.

The four stars in the "bowl" of the little dipper are unusual in that they are of second, third, fourth and fifth magnitude. Hence they provide an easy guide to determining what magnitude stars are visible, useful for city dwellers or testing your eyesight.

is a constellation in the northern sky, the name of which means Smaller Bear in Latin. It is one of the 88 modern constellations, and was also one of the 48 listed by Ptolemy. It is notable as the location of the north celestial pole, although this will change after some centuries due to the precession of the equinoxes.