The darkest days are upon the residents of the Northern Hemisphere as daylight dwindles and the night lingers longer. Meanwhile, those in the Southern Hemisphere bask in their warmest and longest days—and those at the Equator continue to observe consistent days and nights.
These changing lengths of days and nights depend on where you are on Earth and the time of year. The tilt of the Earth’s axis and its path around the sun affect the number of daylight hours.
Today’s post highlights two simple and elegant animations that help demonstrate how different latitudes experience the sun’s light over the course of one year. The first comes from Reddit user harplass, while the second comes from data scientist Neil Kaye.
Longer and Shorter Days
The Ancient Greeks envisioned the movement of the sun as a Titan named Helios who rode across the sky in a horse-drawn chariot, illuminating the known world below. A rosy-fingered dawn would herald his imminent arrival, while the arrival of the dusk god Astraeus, ever on Helios’ heels, marked the passage of day into night.
Today, time is not at the whims of Greek mythology but by the measurable and consistent movement of celestial bodies. A day on Earth is 24 hours long, but not every day has 12 hours of daylight and 12 hours of night. The actual time of one Earth rotation is a little shorter–about 23 hours and 56 minutes.
Daytime is shorter in winter than in summer, for each hemisphere. This is because the Earth’s imaginary axis isn’t straight up and down, it is tilted 23.5 degrees. The Earth’s movement around this axis causes the change between day and night.
During summer in the Northern Hemisphere, daylight hours increase the farther north you go. The Arctic gets very little darkness at night. The seasonal changes in daylight hours are small near the Equator and more extreme close to the poles.
Length of a Rotation: Equinoxes and Solstices
There are four events that mark the passing stages of the sun, equinoxes and solstices.
The two solstices happen June 20 or 21 and December 21 or 22. These are the days when the sun’s path in the sky is the farthest north or south from the Equator. A hemisphere’s winter solstice is the shortest day of the year and the summer solstice the year’s longest.
In the Northern Hemisphere the June solstice marks the start of summer: this is when the North Pole is tilted closest to the sun, and the sun’s rays are directly overhead at the Tropic of Cancer.
The December solstice marks the start of winter when the South Pole is tilted closest to the sun, and the sun’s rays are directly overhead the Tropic of Capricorn.
The equinoxes happen around March 21 and September 23. These are the days when the sun is exactly above the Equator, which makes day and night of equal length.
Stand in the Place Where You Are
It is always darkest before the dawn, and every passing of solstice marks a time of change. As the Northern Hemisphere heads into the winter holiday season, it also marks the advent of longer days and the inevitable spring and summer.
The lengths of days and nights are constantly changing, but every one will get their time in the sun, at some point.
What’s Made from a Barrel of Oil?
Oil is a building block that makes modern life possible. Here are the proportion of finished products that are created from a barrel of oil.
What Products Are Made from a Barrel of Oil?
From the gasoline in our cars to the plastic in countless everyday items, crude oil is an essential raw material that shows up everywhere in our lives.
With around 18 million barrels of crude oil consumed every day just in America, this commodity powers transport, utilities, and is a vital ingredient in many of the things we use on a daily basis.
This graphic visualizes how much crude oil is refined into various finished products, using a barrel of oil to represent the proportional breakdown.
Barrel of Oil to Functional Fuel and More
Crude oil is primarily refined into various types of fuels to power transport and vital utilities. More than 85% of crude oil is refined into fuels like gasoline, diesel, and hydrocarbon gas liquids (HGLs) like propane and butane.
Along with being fuels for transportation, heating, and cooking, HGLs are used as feedstock for the production of chemicals, plastics, and synthetic rubber, and as additives for motor gasoline production.
|Refined Crude Oil Product||Share of Crude Oil Refined|
|Hydrocarbon gas liquids||2.0%|
Source: Canadian Association of Petroleum Producers
Crude oil not only powers our vehicles, but it also helps pave the roads we drive on. About 4% of refined crude oil becomes asphalt, which is used to make concrete and different kinds of sealing and insulation products.
Although transportation and utility fuels dominate a large proportion of refined products, essential everyday materials like wax and plastic are also dependent on crude oil. With about 10% of refined products used to make plastics, cosmetics, and textiles, a barrel of crude oil can produce a variety of unexpected everyday products.
Personal care products like cosmetics and shampoo are made using petroleum products, as are medical supplies like IV bags and pharmaceuticals. Modern life would look very different without crude oil.
The Process of Refining Crude Oil
You might have noticed that while a barrel of oil contains 42 gallons, it ends up producing 45 gallons of refined products. This is because the majority of refined products have a lower density than crude oil, resulting in an increase in volume that is called processing gain.
Along with this, there are other inputs aside from crude oil that are used in the refining process. While crude oil is the primary input, fuel ethanol, hydrocarbon gas liquids, and other blending liquids are also used.
|U.S. Refiner and Blender Inputs||Share of Total|
|Hydrocarbon gas liquids||3.0%|
The process of refining a 30,000-barrel batch of crude oil typically takes between 12-24 hours, with refineries operating 24 hours a day, 365 days a year. Although the proportions of individual refined products can vary depending on market demand and other factors, the majority of crude oil will continue to become fuel for the world’s transport and utilities.
The Difficulty of Cutting Down on Crude Oil
From the burning of heavy fuels that tarnish icebergs found in Arctic waters to the mounds of plastic made with petrochemicals that end up in our rivers, each barrel of oil and its refined products impact our environment in many different ways.
But even as the world works to reduce its consumption of fossil fuels in order to reach climate goals, a world without crude oil seems unfathomable.
Skyrocketing sales of EVs still haven’t managed to curb petroleum consumption in places like Norway, California, and China, and the steady reopening of travel and the economy will only result in increased petroleum consumption.
Completely replacing the multi-faceted “black gold” that’s in a barrel of oil isn’t possible right now, but as electrification continues and we find alternatives to petrochemical materials, humanity might at least manage to reduce its dependence on burning fossil fuels.
Mapped: Visualizing U.S. Oil Production by State
The U.S. is the largest oil producer in the world. Here we map the share of oil production in the country by all 50 states in 2020.
Mapped: Visualizing U.S. Oil Production by State
In 2018, the United States became the world’s top crude oil producer. It has strongly held this position ever since.
According to the U.S. Energy Information Administration (EIA), the country accounted for nearly 15% of the world’s total oil production in 2020, churning out close to 13 million barrels of crude oil per day—more than Russia or Saudi Arabia.
Although total U.S. oil production declined between 1985 and 2008, annual production increased nearly every year from 2009 through 2019, reaching the highest amount on record in 2019.
The Dominant Oil Producing States
Impressively, 71% of total U.S. oil production came from just five states. An additional 14.6% came from the Gulf of Mexico, which is a federal jurisdiction.
Here are the five states that produce the largest amount of crude oil:
|Share of Total Production|
Rounding the top 10 are states like Alaska, California, Wyoming, Louisiana, and Utah.
Texas is undoubtedly the largest oil-producing state in the United States. In 2020, Texas produced a total of 1.78 billion barrels of oil. Texas is home to the most productive U.S. oil basin, the Permian, routinely accounting for at least 50% of total onshore production. A distant second is North Dakota, which produced about 431.2 million barrels of oil in 2020.
Regional Distribution of U.S. Oil Production
A total of 32 of the 50 U.S. states produce oil. They are divided among five regional divisions for oil production in the U.S., known as the Petroleum Administration for Defense Districts (PADD).
These five regional divisions of the allocation of fuels were established in the U.S. during the Second World War and are still used today for data collection purposes.
Given that Texas is the largest U.S. oil-producing state, PADD 3 (Gulf Coast) is also the largest oil-producing PADD. PADD 3 also includes the federal offshore region in the Gulf of Mexico. There are around 400 operational oil and gas rigs in the country.
Impact of U.S. Oil Production on Employment
Rapid growth in oil production using advanced drilling methods has created high-paying jobs in states like North Dakota and Texas.
Thanks to the rapid development in the Bakken Shale formation, North Dakota boasts the nation’s lowest unemployment rate. The state has also grown personal income and state economic output at a fast rate, due to oil and gas industry growth.
Oil production from the Eagle Ford Shale has transformed a relatively poor region of South Texas into one of the nation’s most significant economic development zones. In fact, due largely to the oil and natural gas industry, the Texas Comptroller estimates that Texas has recovered 100% of the jobs lost during the Great Recession.
Looking to the Future
The U.S. slashed its oil production forecast through next year just as OPEC and its allies begin to roll back their production cuts in the coming months.
U.S. oil output will drop to 11.04 million barrels a day this year, down from a forecasted 11.15 million. This was a result of the deep freeze that shut down the oil industry in Texas. The EIA also lowered its output forecast for 2022 by 100,000 barrels a day.
Despite its forecast for a rise in supply from outside the cartel this year, OPEC said in its report that it is uncertain about the levels of investment expected to determine the non-OPEC supply outlook for the years to come.
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