Omari Gates
The Southern Cross is a constellation in the southern sky that is centred on four bright stars in a cross-shaped asterism. It is commonly known as the Southern Cross and is the smallest of the 88 modern constellations. The Southern Cross is used to find the south celestial pole and the direction due south. It is represented on the national flags of Australia, New Zealand, Papua New Guinea, Samoa, and Brazil. The Southern Cross is also known as the constellation Crux, which means cross in Latin.
| Characteristics | Values |
|---|---|
| Constellation used to find south | Southern Cross |
| Other names for Southern Cross | Crux, Melipal, Chakana |
| Number of stars in Southern Cross | 5 |
| Countries with Southern Cross on flag | Australia, New Zealand, Papua New Guinea, Samoa, Brazil |
| Stars in the Southern Cross | Alpha Crucis (Acrux), Beta Crucis (Mimosa), Gamma Crucis (Gacrux), Delta Crucis (Imai), Epsilon Crucis (Ginan) |
| Brightest star in the Southern Cross | Alpha Crucis (Acrux) |
| Southern Cross in the Australian flag | The five stars represent the Southern Cross |
Explore related products
What You'll Learn
Polaris is not visible from Australia
Polaris, also known as the North Star, is not visible from Australia. This is because Polaris is located almost directly above the North Pole, relative to the Earth. As a result, the further south one goes, the lower Polaris will be in the sky.
The visible sky has 90° of visibility, with the horizon at 0° altitude and the highest part of the sky at 90° altitude. At the North Pole, Polaris has an altitude of 90°. For every degree of latitude, one moves south, and Polaris also decreases by 1° in altitude. This means that at the Equator, Polaris is exactly at the horizon at 0°. When one goes south of the Equator, Polaris has a negative altitude, meaning it is below the horizon and cannot be seen.
While Polaris can be seen just south of the equator in places like Nairobi, Kenya, it is still barely visible and requires ideal sky conditions. The Tropic of Capricorn, which crosses through the Northern parts of Australia, is too far south for Polaris to be visible. Atmospheric refraction, which allows Polaris to be seen from as far south as 1.23° south latitude, and terrain may provide some leeway. However, typically, Polaris cannot be seen from the equator because it is too dim that low on the horizon.
Therefore, Polaris cannot be seen from Australia, as it is simply too low on the horizon, and there is a planet in the way.
Australia's COVID-19 Cure: Fact or Fiction?
You may want to see also
Explore related products
The Southern Hemisphere does not have a 'Southern Star'
The Southern Hemisphere does not have a Southern Star. However, the Southern Cross, also known as the constellation Crux, is used to find the south celestial pole and the direction of due south. The Southern Cross is smaller than most people expect, and it can be challenging to distinguish it from the many other crosses in the sky.
The Southern Cross is comprised of four bright stars in a cross-shaped asterism. The constellation is centred on these four stars, which form a cross-shaped asterism commonly known as the Southern Cross. The four main stars of the Southern Cross are Alpha Crucis or Acrux, Beta Crucis or Mimosa, Gamma Crucis or Gacrux, and Delta Crucis or Imai. Epsilon Crucis or Ginan also lies within the cross asterism. Alpha Crucis or Acrux is the brightest star in the Southern Cross and the 12th brightest star in the night sky.
The Southern Cross is of great cultural significance in many Southern Hemisphere nations, including Australia, where it is featured on the national flag. The Southern Cross is also represented on the flags of New Zealand, Papua New Guinea, Samoa, and Brazil. In Brazil, the Southern Cross has been featured on currency and in songs and literature. In Argentina, the Southern Cross is mentioned in the epic poem Martín Fierro, and in the lyrics of the Brazilian National Anthem.
The Southern Cross is used for navigation in the Southern Hemisphere, much like Polaris is used in the Northern Hemisphere. By drawing a line from Gamma Crucis (the foot of the crucifix) about four and a half times beyond, one can find a point close to the Southern Celestial Pole. This point also intersects a perpendicular line taken southward from Alpha Centauri to Beta Centauri, two stars of a similar magnitude and declination to Crux. Alpha and Beta Centauri are often referred to as the "Southern Pointers" or simply "the Pointers", making it easier to identify the Southern Cross.
Chaga in Australia: Where to Find It
You may want to see also
Explore related products
The Southern Cross is a popular constellation for navigation
The Southern Cross, also known as the constellation Crux, is a popular constellation for navigation in the Southern Hemisphere. It is used to find the south celestial pole and the direction of due south. The Southern Cross is made up of four bright stars in a cross-shaped asterism, with the brightest star being Alpha Crucis or Acrux. It is the 12th brightest star in the night sky and is 321 light-years away from Earth.
The Southern Cross is well-known around the world and holds special meaning in Australia and New Zealand, where it is circumpolar and can be seen throughout the year. It is also represented on the national flags of both these countries, as well as Papua New Guinea, Samoa, and Brazil. The constellation has various names in different cultures and has been referenced in songs and literature.
Finding the pointer stars of Alpha and Beta Centauri is the key to becoming familiar with the Southern Cross. These stars are often referred to as the "Southern Pointers" or simply "the Pointers". By drawing a line through the two stars at the "head" and the "foot" of the cross and extending it to the dark patch of the sky, and then joining a line between the two pointers, you can find the middle of the line and draw a perpendicular line down to find the south celestial pole.
Another method to find the south celestial pole using the Southern Cross is to imagine a line extended out from the long axis of the constellation. At the same time, imagine another perpendicular line extending from between the Pointers. The intersection of these two lines marks the south celestial pole, and dropping a line straight down to the horizon will give you due south.
Driving to Australia: How Far is it Really?
You may want to see also
Explore related products
The Milky Way is best viewed from the Southern Hemisphere
The Milky Way is a magnificent sight to behold, and for those wanting to view it in all its glory, the Southern Hemisphere is the place to be. The Southern Hemisphere offers a unique perspective on the Milky Way, with its core reaching high into the sky and providing a breathtaking view of our galaxy. This is in contrast to the Northern Hemisphere, where the Milky Way is visible low on the horizon.
The Southern Hemisphere sky boasts a host of galactic and intergalactic objects unseen in the Northern Hemisphere. The brightest and busiest sections of the Milky Way are found deep in the southern skies, making it a stargazer's paradise. From Australia, the bulging central region of our galaxy is visible directly overhead during the middle of the year. This includes the Sagittarius Star Clouds, which can be viewed with binoculars or a rich-field refracting telescope.
The best time to view the Milky Way in the Southern Hemisphere is from March to October, a period aptly named 'Milky Way Season' by amateur astronomers. During this time, the core of the Milky Way stretches upwards into the night sky, creating a spectacular sight. The ideal viewing nights are around the New Moon phase, as the darker skies without moonlight interference allow for better visibility of stars and finer details of the Milky Way.
The Southern Hemisphere's lack of light pollution also contributes to its unparalleled view of the Milky Way. Remote areas away from bright city lights provide the optimal conditions for stargazing, allowing for the observation of countless stars and the famous band of "clouds" that make up the Milky Way.
The Milky Way is a sight that should be on everyone's bucket list, and the Southern Hemisphere offers the ultimate viewing experience. With its bright galactic center, unique constellations, nebulae, and stars, the Southern Hemisphere provides a truly magical stargazing adventure.
Meat Pies: Australia's Favorite Comfort Food
You may want to see also
Explore related products
The Southern Hemisphere has unique circumpolar constellations
Circumpolar constellations are constellations that are visible all night and throughout the year. The Southern Hemisphere has its own unique circumpolar constellations that are not visible from the Northern Hemisphere. These include Carina, Centaurus, and Crux, which are visible from most locations in the Southern Hemisphere. Crux, the smallest constellation in the sky, is the easiest to identify as it contains the Southern Cross, a grouping of five stars that has played a prominent role in many cultures south of the equator. The Southern Cross is featured on the national flags of Australia, New Zealand, Samoa, Papua New Guinea, and Brazil. It is also used for navigation to find true south.
Other Southern Hemisphere circumpolar constellations include Phoenix, Grus, Tucana, Eridanus, Hydrus, Lupus, and Crux, among others. These constellations never rise or set but only rotate around the south celestial pole and can be seen from southern latitudes at any time of the year.
In contrast, the only truly circumpolar constellations visible from the Northern Hemisphere are Cassiopeia, Cepheus, Draco, Ursa Major, and Ursa Minor, which are found circling the North Star (Polaris) located in Ursa Minor. These constellations are also not visible from the Southern Hemisphere.
The night sky in the Southern Hemisphere, such as in Australia, offers a unique perspective with a variety of galactic and intergalactic objects not visible from the Northern Hemisphere. For example, the brightest and busiest sections of the Milky Way are best seen in the southern skies. The Sagittarius Star Clouds, embedded in the Milky Way, can be observed directly overhead from Australia during the middle of the year.
Exploring Australia's Unique Country Makeup
You may want to see also
Frequently asked questions
No, the Southern Hemisphere does not have its own 'Southern Star'. However, there are several circumpolar constellations unique to that part of the world, including Carina, Crux, and Centaurus.
The Southern Cross, or Crux constellation, is a popular way to find the south celestial pole in the Southern Hemisphere. It is almost always visible from anywhere in Australia and has been used for navigation.
The Sagittarius Star Clouds, the core of the Milky Way, are visible directly overhead in Australia during mid-year. The Sculptor Galaxy can also be seen with more clarity from Australia than from the UK. The Southern Hemisphere also enjoys a better view of the Large and Small Magellanic Clouds, the Milky Way's two satellite galaxies.
