Geodetske meritve Ivan Škedelj Močivnik

27/07/2025

☃️🌍 The Antarctic Region: The Antarctic region refers to the area surrounding the South Pole, encompassing the continent of Antarctica and the surrounding Southern Ocean. It is one of the most extreme and unique environments on Earth, both climatically and ecologically. Here's a detailed overview:

🌍 Geographical Features:

1. Continent: Antarctica is the fifth-largest continent, covering about 14 million km².

2. Location: Entirely in the Southern Hemisphere, mostly south of the Antarctic Circle (66.5° S latitude).

3. Surrounding Ocean: The Southern Ocean, formed by the convergence of the Atlantic, Pacific, and Indian Oceans.

4. Landscape: Vast ice sheets, glaciers, mountain ranges (e.g., Transantarctic Mountains), dry valleys, and coastal ice shelves (like the Ross Ice Shelf).

❄️ Climate:

1. Coldest place on Earth – temperatures can drop below −80°C (−112°F) in winter.

2. Low precipitation – classified as a polar desert; mostly receives snowfall.

3. Winds: Powerful katabatic winds (cold, dense air flowing downhill).

4. Summer: Some coastal areas may reach -2°C to 8°C, allowing limited melting.

🧊 Ice and Glaciers:

1. Contains about 90% of the world's freshwater ice.

2. The Antarctic Ice Sheet is the largest single mass of ice on Earth.

3. Major ice shelves: Ross, Ronne, Larsen.

🌱 Flora and Fauna:

1. Flora: Very limited; mostly mosses, lichens, algae, and fungi.

2. Fauna: No native land mammals or reptiles; marine life is rich:

Birds: Penguins (e.g., Emperor, Adelie), skuas, petrels.

Marine mammals: Seals (e.g., Weddell, Leopard), whales.

Fish & krill: Key parts of the food chain in the Southern Ocean.

🧪 Scientific Importance:

1. Antarctica is a natural laboratory for climate, astronomy, and glaciology research.

2. Ice cores provide records of Earth’s past climate (up to 800,000 years).

3. Home to many international research stations (e.g., India's Bharati & Maitri, USA’s McMurdo, Russia’s Vostok).

🏛️ Political Status:

1. No sovereign nation owns Antarctica.

2. Governed by the Antarctic Treaty System (1959):

3. Promotes peaceful use, scientific research, bans military activity and mineral mining.

4. Signed by 50+ countries.

⚠️ Environmental Concerns:

1. Global warming is causing ice melting, affecting sea levels.

2. Ozone hole was discovered over Antarctica (especially in the 1980s).

3. Human impact through tourism and station activities needs regulation.

20/07/2025

▪️Understanding the Summer Solstice (June 21)

1.What is the Summer Solstice?

It’s the longest day of the year in the Northern Hemisphere, occurring on June 21, when the Sun is directly overhead the Tropic of Cancer (23.5° N).

2.Arctic Circle (66.5° N):

- Experiences 24 hours of daylight.
- This phenomenon is called the Midnight Sun-a continuous polar day that lasts about 6 months.

3.Tropic of Cancer (23.5° N):

- Receives the most direct sunlight- 13.5 hours of daylight.
- It marks the northernmost point where the sun can be directly overhead.

4.Equator (0°):

- Receives 12 hours of daylight.
- Days and nights are almost equal throughout the year here, due to its central position on Earth.

5.Tropic of Capricorn (23.5° S):

- Experiences 10.5 hours of daylight.
- It’s winter in the Southern Hemisphere, and sunlight is less direct.

6.Antarctic Circle (66.5° S):

Experiences 0 hours of daylight. It’s the polar night-6 months of continuous darkness in the Southern Hemisphere.

This solstice marks a turning point in Earth’s orbit, impacting global climate patterns, ecosystems, and ancient cultural traditions.

07/07/2025

04/07/2025

03/07/2025

As of 2025, nearly 10,000 active satellites orbit Earth — a record surge fueled by the rise of satellite-based technologies, global internet coverage, and mega-constellations like SpaceX’s Starlink. While these satellites are transforming communications and bridging the digital divide, they also raise serious concerns about space debris, orbital congestion, and collision risks.

With more satellites crowding low Earth orbit (LEO), the chance of catastrophic collisions grows, potentially generating thousands of high-speed debris fragments. Even tiny particles can damage satellites, threatening GPS, weather forecasting, financial systems, and space missions.

To address this, agencies and companies are developing debris removal tech, AI-driven traffic control, and automated de-orbit systems. Still, the pace of launches highlights the urgent need for global regulations, sustainable space policies, and coordinated governance to ensure a safe and viable orbital future.

20/06/2025

☀️ You may not have noticed, but the exact date and time that the summer solstice occurs changes year to year. In simple terms, it has to do with how the Gregorian calendar interacts with Earth's orbit relative to the seasonal cycle and its tilt. This year the solstice occurs on June 20th at 8:41 PM MDT. It shifts between June 20th, June 21st, and rarely June 22nd. In Boise, daylight on June 20th will be longer than June 21st by a single second. The next occurrence of a June 22nd solstice isn't until 2203. Here is a non-astronomer's explanation:

There are 365.2422 days in a tropical year (length of the seasonal cycle which is related to Earth's tilt) compared to 365 days in a Gregorian year. That almost 1/4 of a day decimal would normally mean seasons shift year to year, and they do: which is why we have a leap year every 4 years. The summer solstice is defined as the moment at which Earth's tilt in a hemisphere is most inclined towards the Sun. The summer solstice occurs once every tropical year because of its relation to Earth's tilt. So because of the slight difference between a tropical and Gregorian year, the solstice happens 0.2422 days later each year, until a leap year's extra day in February causes it to happen a day earlier.

However, because 0.2422 is not exactly 1/4 there are additional leap year rules to try to help correct the Gregorian calendar. So we skip leap years that are divisible by 100, unless they are also divisible by 400. Even this leaves us with a 0.0003 day difference between a tropical year and the average Gregorian year. So in roughly 3,300 years we'll have an extra day to worry about.

Anyhow that's a lot for a Sunday, Happy Father's Day to all the dads out there!

19/06/2025

When a meteor speeds into Earth’s atmosphere, it lights up due to intense friction with the air—generating extreme heat. That heat makes the meteor glow, but here's the cool part: the color of that glow tells us what it's made of!

Just like fireworks, different elements shine in different colors when heated. As the meteor blazes through the sky at tens of kilometers per second, atoms in both the meteor and the surrounding air get excited—and they release light in specific wavelengths. The result? A fiery, colorful display that reveals the meteor’s chemical makeup.

19/06/2025

☀️ June 21 – Hello, Summer! 🌿

The summer solstice brings the longest day and shortest night of the year in the Northern Hemisphere.

As Earth tilts 23.5° toward the Sun, we welcome the start of astronomical summer — with longer days, warm evenings, and more time under the sky.

For centuries, this moment has been celebrated as a time of light, renewal, and connection to nature.

So step outside, enjoy the golden hours, and maybe catch Mars, Saturn, or a shooting star in the twilight. 🌞