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Uganda At The Equator - Water Experiment | Coriolis Effect

In this article, we will explore the meaning and significance of the phrase Webale Sebo in the Ugandan culture. This phrase is widely used in Uganda as a way of expressing gratitude and appreciation. We will delve into the origins of this phrase and how it is used in everyday conversations.

Meaning of Webale Sebo:

Webale Sebo is a Luganda phrase which translates to Thank you, Sir in English. The word Webale means thank you, while Sebo is a term of respect used to address someone of higher social status, such as an elder, teacher, or leader.

Origins of Webale Sebo:

The origins of the phrase Webale Sebo can be traced back to the Buganda Kingdom in Uganda. It was traditionally used as a way of showing respect and appreciation to the king or chief of the tribe. Over time, the phrase became more widespread and is now used as a general expression of gratitude.

Usage of Webale Sebo:

Webale Sebo is commonly used in Uganda as a way of expressing appreciation and gratitude in everyday conversations. It is often used when someone does something kind or helpful, such as opening a door or offering assistance. The phrase is also used in formal settings, such as business meetings or ceremonies, to show respect and gratitude to those in positions of authority.

Examples of Webale Sebo in use:

- Webale Sebo for helping me with my bags.

- Webale Sebo for the wonderful meal, it was delicious.

- Webale Sebo for your time and consideration, it is greatly appreciated.

In conclusion, Webale Sebo is an important phrase in Ugandan culture that signifies gratitude and respect. Its origins can be traced back to the Buganda Kingdom and it is now widely used in everyday conversations. Whether in formal or informal settings, Webale Sebo is a powerful way of expressing appreciation and acknowledging the contributions of others.

UV, Optical and IR Photometry - GROWTH Astronomy School 2020

Hello and welcome to this lecture on observational techniques for transient studies. My name is Chris Coppoli and I am from Liverpool John Moores University in the UK. In this lecture, I will be talking about photometry, which is the measurement of integrated flux received from a celestial target. This is a fundamental measurement in astronomy and is used to

Deneb! Very distant yet one of the brightest stars in the night sky.

- The origin of the name Deneb comes from the Arabic word tale

- Deneb is the 19th brightest star and is very luminous

- It is located in the constellation Cygnus

Facts:

- Deneb is approximately 2,600 light years away

- It eliminates each year on October 23 and September 7

- Deneb is an astronomical estergen in the northern celestial hemisphere

- Deneb is an alpha cygni variable star

- Deneb's brightness varies between magnitudes 1.21 to about minus 1.29

- Its average apparent magnitude is around 1.25

- Deneb is classified as a blue supergiant, a star about 100 times larger than the sun

- Deneb loses mass at a rate of about 100 times the rate of the sun's mass loss

- Deneb is almost twice as hot as our sun with surface average temperatures estimated to be around 8,525 kelvins

- Deneb is a fascinating star with unique characteristics

- Despite its distance and size, Deneb continues to fascinate astronomers and stargazers alike

- There are still many mysteries surrounding Deneb, including the possibility of planets orbiting around it.

The Broken Cosmic Distance Ladder

that the upcoming transit of venus in 1761 and 1769 would provide an opportunity to measure the distance to the sun. The idea was that astronomers located at different points on Earth could observe the transit and measure the parallax shift of Venus across the sun's disk. Using trigonometry, they could then calculate the distance between the Earth and the sun, which would give the value of the astronomical unit.

The expeditions to observe the transit of Venus were a major international effort involving astronomers from different countries. They traveled to different parts of the world, including Tahiti, Siberia, and Norway, to maximize the separation of their observing stations and obtain more accurate parallax measurements. However, the observations were not entirely successful due to various factors such as unfavorable weather conditions, equipment malfunctions, and inaccurate timing of the transit. Nevertheless, the data collected from the expeditions allowed astronomers to refine their estimates of the astronomical unit and obtain a value that was within a few percent of the modern value.

With the astronomical unit known, astronomers could now use Kepler's laws to determine the distances of other planets and objects in the solar system. However, measuring distances beyond the solar system was still a challenge. The next rung in the cosmic distance ladder was provided by the discovery of variable stars, specifically the Cepheid variables, which pulsate with a regular period that is related to their intrinsic brightness. By measuring the period and apparent brightness of a Cepheid variable, astronomers could determine its absolute brightness and use that to calculate its distance from Earth. This method, developed by Henrietta Swan Leavitt in the early 20th century, was instrumental in establishing the distances to nearby galaxies and laying the foundation for the modern field of extragalactic astronomy.

However, the cosmic distance ladder suffered a major setback in the 1990s with the discovery of a discrepancy between the values obtained using Cepheid variables and another method based on the brightness of supernovae, which are explosive events that occur when massive stars run out of fuel and collapse. The supernova method, which had been used to measure the distances of more distant galaxies, yielded values that were systematically larger than those obtained using Cepheid variables. This discrepancy, known as the Hubble constant problem, is still unresolved and represents one of the major challenges facing modern cosmology.

In conclusion, measuring distances in the universe is a complex and challenging task that has occupied astronomers for centuries. The cosmic distance ladder, which has evolved over time with new discoveries and technological advancements, has allowed us to explore the vastness of space and gain insights into the structure and evolution of the cosmos. However, the ladder is not without its flaws and limitations, and much work remains to be done to refine our measurements and deepen our understanding of the universe.

Rare Photos Not Appropriate for History Books

Facts First Presents Rare Photos Not Appropriate for History Books

Throughout the years, photography has captured small glimpses of today's gone-by. Recently, there's been a surge in previously unreleased and freshly uncovered photographs. These pictures have ranged from highlighting atrocities to all-inspiring to eerie to rare photos not appropriate for history books and everything in between.

Rare Photos:

- Paris France 1880s constructing the Statue of Liberty

- Salvador Dali 1953 in a goat-drawn carriage

- Diving suit 1911 the inventor

- Russia 1924 game of human chess

- The Titanic 1912 bon voyage

- First meeting 1919 Helen Keller and Charlie Chaplin

- The canals of Venice 1956 cleanup time

- Marilyn Monroe 1956 the seven-year itch

- Steven Spielberg 1975 Jaws

- World War II circa 1940 smiling Russian woman soldier

- Boston Marathon 1967 first woman runner Katherine Schweitzer

- Montana 1901 eligible bachelors

- Giza 1870s on the road there

- Photograph recording 1916 mountain chief

- Disneyland 1961 employee cafeteria

- Gettysburg 1913 the 50th anniversary

- James Naismith 1890s the inventor of basketball

- Film icons 1928 the MGM lion

- World War I circa 1915 when bullets collide

- Zero gravity 1958 18 clause

- Testing circa 1950s the H-bomb

- Tourists at the White House 1981

- Pablo Escobar

- The Tour Eiffel 1932 painting in the sky

- Going for a stroll 1938 gas proofed

- Skyscrapers 1934 baby cages

- Audrey Hepburn 1958 Pippin

- Stockholm 1890 the telephone tower

- Journey to space 1957 the first animal Leica

- Space chimp 1961 Ham Ham the Astro chimp

- Swimsuits 1922 your measurements please

- Military tradition 1952 must be Air Force graffiti

- New and France 1950 Coca-Cola

- New to Norway 1905 bananas

- Read all about it 1912 the Titanic disaster

- Elvis Presley 1958 before he was king

- Prohibition circa 1920s a tower of barrels

These rare photos capture moments in history that are not always appropriate for history books. They offer a glimpse into the past and allow us to reflect on the events that shaped our world. These pictures are a reminder of the power of photography and its ability to capture a moment in time that can last forever.

Tangible Things of American Astronomy, or What Does a Computer Have in Common with a Teapot?

Sara, a historian of science with expertise across many different fields, has worked as a curator at the collection of historical scientific instruments since 2000. She has a wealth of knowledge that spans from astronomy to the history of astronomy, including comets, navigation, clocks, timekeeping, computers, and telescopes.

Why Documenting and Preserving Old and Obsolete Objects Matters:

Not everything old is valuable, but many outmoded objects can provide insight into why things are the way they are, why we believe what we believe, and how we can change them. For example, Captain John Smith's globe sundial was a microcosm of the universe that helped him escape death at the hands of Native Americans. The sundial was one of many mathematical instruments that enabled European settlers to dominate the New World. Almanacs, like those printed by Harvard College tutors starting in 1639, reflected a Puritan and Christian worldview that encouraged the study of nature as a sign of God's will. Comets and eclipses, which were once feared as portents of evil, became occasions for research in the 18th century. Samuel Williams, Winthrop's successor, observed a total solar eclipse in Penobscot Bay, Maine, during the American Revolution, with the help of Benjamin Franklin. Harvard College Observatory, founded in 1847, employed the Bonds, who developed the American method of astronomical observation, which became the standard for accuracy in Europe and America. Harvard also sold time to railroad companies, using chronometers to regulate conductors' timepieces and astronomical regulators in railroad stations.

The preservation and documentation of old and obsolete objects can provide valuable insights into history, science, and culture. By examining these objects, we can better understand why things are the way they are, why we believe what we believe, and how we can change them. Sara's expertise in the history of science and her work as a curator at the collection of historical scientific instruments make her a valuable resource for anyone interested in these topics.