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Mac OS 9 and Cooperative Multitasking Mac OS 9 is the latest generation of an operating system architecture that has been evolving since 1982. When the Macintosh was first released, the operating system was designed to support a single user using a single program on a single computer.
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Processor and memory The heart of the computer was a Motorola 68000 microprocessor running at 7.8336 MHz, connected to 128 KB RAM shared by the processor and the display controller. The boot procedure and some operating system routines were contained in an additional 64 KB ROM chip. Apple did not offer RAM upgrades. If the computer is on and the computer is running properly, the must be active and running. A free operating system at the heart of the Mac OS X. Mac OS is a line of operating systems created by Apple Inc. It comes preloaded on all new Macintosh computers, or Macs. All of the recent versions are known as Mac OS X (pronounced Mac O-S Ten), and their specific version names are Mountain Lion (released in 2012), Lion (2011), and Snow Leopard (2009).

For ages now, every annual report on desktop operating system market share has had the same top two contenders: Microsoft's Windows in a commanding lead at number one and Apple's macOS in distant second place. But in 2020, Chrome OS became the second-most popular OS, and Apple fell to third.

That's according to numbers from market data firm IDC and a report on IDC's data by publication GeekWire. Chrome OS had passed macOS briefly in individual quarters before, but 2020 was the first full year when Apple's OS took third place.

Despite the fact that macOS landed in third, viewing this as an example of Google beating out Apple directly might not be accurate. Rather, it's likely that Chrome OS has been primarily pulling sales and market share away from Windows at the low end of the market. Mac market share actually grew from 6.7 percent in 2019 to 7.5 percent in 2020.

Meanwhile, Chrome OS skyrocketed from 6.4 percent in 2019 to 10.8 percent in 2020. Windows fell from 85.4 percent to 80.5 percent.

The trend looks to be in Google's favor here, but 2020 was far from a normal year. Last month, IDC's report on PC sales showed the first year of consistent growth of traditional PC (desktop, laptop, workstation) sales in years. Even then, IDC indicated that the increase in sales was driven in large part by the expansion of Chromebooks both within and outside of the education market.

As students in many communities have had to attend class virtually from home and their parents have had to do work remotely, too, PC sales jumped during the year. Chrome OS was a big part of that. But the entire market grew overall, not just Chrome OS. IDC also noted that gaming PCs were a big driver of growth, and it was a particularly strong year for the Mac.

As some of the world may find a new kind of post- or late-pandemic normalcy later this year or next year, new sales figures will give a clearer indication of where things will go in the future, not just how they went in 2020. But at least in the education space, the future of Chrome OS looks fairly bright.

features

sky

default catalogue of over 600,000 stars
extra catalogues with more than 177 million stars
default catalogue of over 80,000 deep-sky objects
extra catalogue with more than 1 million deep-sky objects
asterisms and illustrations of the constellations
constellations for 20+ different cultures
images of nebulae (full Messier catalogue)
realistic Milky Way
very realistic atmosphere, sunrise and sunset
the planets and their satellites

interface

a powerful zoom
time control
multilingual interface
fisheye projection for planetarium domes
spheric mirror projection for your own low-cost dome
all new graphical interface and extensive keyboard control
telescope control

visualisation

equatorial and azimuthal grids
star twinkling
shooting stars
tails of comets
iridium flares simulation
eclipse simulation
supernovae and novae simulation
3D sceneries
skinnable landscapes with spheric panorama projection

customizability

plugin system adding artifical satellites, ocular simulation, telescope control and more
ability to add new solar system objects from online resources...
add your own deep sky objects, landscapes, constellation images, scripts...

news

system requirements

minimal

Linux/Unix; Windows 7 and above; Mac OS X 10.12.0 and above
3D graphics card which supports OpenGL 3.0 and GLSL 1.3 or OpenGL ES 2.0
512 MiB RAM
420 MiB on disk
Keyboard
Mouse, Touchpad or similar pointing device

developers

Project coordinator: Fabien Chéreau
Graphic designer: Johan Meuris, Martín Bernardi
Developer: Alexander Wolf, Guillaume Chéreau, Georg Zotti, Marcos Cardinot
Continuous Integration: Hans Lambermont
Tester: Khalid AlAjaji
and everyone else in the community.

social media

collaborate

You can learn more about Stellarium, get support and help the project from these links:

acknowledgment

If the Stellarium planetarium was helpful for your research work, the following acknowledgment would be appreciated:

This research has made use of the Stellarium planetarium

Zotti, G., Hoffmann, S. M., Wolf, A., Chéreau, F., & Chéreau, G. (2021). The Simulated Sky: Stellarium for Cultural Astronomy Research. Journal of Skyscape Archaeology, 6(2), 221–258. https://doi.org/10.1558/jsa.17822

Or you may download the BibTeX file of the paper to create another citation format.