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Mars could have a Leap Day like Earth but way more complicated
February 29, “leap day”, is an oddity on the calendar that occurs every four years in an attempt to sync up the Gregorian calendar (the calendar most of the world uses to keep time) with Earth’s rotation around the sun.
One calendar year on Earth is 365 days long; however, the Earth actually takes 365.2422 days to lap the sun. That puts the planet roughly a quarter of a day behind at the end of each year.
To maintain consistency and ensure the seasons line up each year, an extra day was added to the already short month of February — a modification that happens every four years. But even this doesn’t fully solve the problem; additional tweaks are needed.
For instance, if a year is divisible by 100, there’s no extra day — unless the year is divisible by 400. That means that 1700, 1800 and 1900 did not have a leap day, but 2000 did. This adjustment ensures that Earth is as close as possible to the same point in its orbit in consecutive calendar years and keeps our seasons inline.
Unsurprisingly, Earth is not the only planet that needs leap days. The phenomenon could occur on other planets in our solar system as well as those around other stars. That’s because you can’t fit an exact number of spins into one trip around the sun for any planet. There’s usually going to be something left over. Leap days on other worlds, such as Mars, could be more complicated than those here on Earth.
One year on Mars lasts for approximately 668.6 Martian days. (A Martian day is called a sols and equals 24 hours, 39 minutes, and 35.244 seconds.) Future inhabitants might decide that a year on the red planet will be described as 668 days. How do we adjust?
Over the decades, many different ideas for the Martian calendar have been proposed. The most popular one, called the Darian calendar, was created in 1985 by Tomas Gangale.
According to Gangale, the Martian calendar would feature 24 months, each named for the Latin and Sanskrit words for the constellation of the zodiac, like Sagittarius and Dhanus, and so forth. The first five months in each quarter would have 28 Martian days (or sols), with the sixth having only 27. Even-numbered years would total 668 days and odd-numbered years would have 669. The exception to that rule: even-numbered years that were divisible by 10.
Another option was proposed by Michael Allison, a retired NASA scientist. In his version, the Martian calendar would have 668-days divided into 22 months, each totaling 30 or 31 days, similar in fashion to Earth. To make sure the seasons lined up, all years divisible by five will have three leap days, bringing the total to 671.
So which of these calendars do scientists use to keep track of time on Mars? Currently, none.
Instead, they use two systems to keep track of time: one counts the number of Martian days since the start of a mission, and the other keeps track of where Mars was in its orbit at that time.
Right now scientists don’t care if the seasons line up perfectly with the calendar, but that may change when you add humans into the mix. NASA and other space agencies around the world have their sights set on Mars. Once humans land on the red planet and spend significant time there, we are going to need a common calendar to keep track of seasons.
Elon Musk
SpaceX is preparing to launch Starship V2 one final time
The mission will test reentry dynamics, new landing burn configurations, and heat-shield upgrades.
SpaceX is preparing to launch its final Starship V2 rocket on October 13, 2025. The launch closes the curtain on Starship V2 and marks the start of the ambitious spacecraft’s V3 era.
Liftoff for Flight 11 is scheduled for 7:15 p.m. ET from Starbase in South Texas, with a 75-minute launch window. The mission will test reentry dynamics, new landing burn configurations, and heat-shield upgrades ahead of the transition to the next-generation Starship V3.
Starship V3 and beyond
Elon Musk confirmed on X that Starship V3 is already in production and could be “built & tested” and perhaps even flown before the end of 2025. The new version is expected to feature major performance and scale improvements, with Musk stating that Starship V3, provided that things go well, might be capable of reaching Mars, though V4 is more likely to perform a full-scale mission to the red planet.
“Only one more V2 left to launch,” Musk wrote back in August following Starship’s successful Flight 10 mission. In another post, Musk stated that “Starship V3 is a massive upgrade from the current V2 and should be through production and testing by end of year, with heavy flight activity next year.”
Starship V2’s final mission
Flight 11 is designed to push the limits of Starship V2. SpaceX engineers have intentionally removed heat-shield tiles in vulnerable areas to analyze how the vehicle handles atmospheric reentry under stress, as noted in a Space.com report. The test will also refine subsonic guidance algorithms and new landing burn sequences for the Super Heavy booster that would be used for Starship V3.
“Super Heavy will ignite 13 engines at the start of the landing burn and then transition to a new configuration with five engines running for the divert phase. Previously done with three engines, the planned baseline for V3 Super Heavy will use five engines during the section of the burn responsible for fine-tuning the booster’s path, adding additional redundancy for spontaneous engine shutdowns.
“The booster will then transition to its three center engines for the end of the landing burn, entering a full hover while still above the ocean surface, followed by shutdown and dropping into the Gulf of America,” SpaceX wrote in a post on its official website.
Elon Musk
xAI’s new facility will save Memphis 5 billion gallons of water annually
The project was described as a long-needed solution for the region as it will be capable of recycling up to 13 million gallons of greywater daily.
Elon Musk’s artificial intelligence startup, xAI, has officially broken ground on its $80 million wastewater treatment facility in Memphis, Tennessee. The project aims to reduce strain on the Memphis aquifer by 9% and repurpose 20% of wastewater from the nearby Memphis T.E. Maxson wastewater facility that would otherwise flow back into the Mississippi River.
A major step towards sustainability
City officials, including Councilman J. Ford Canale and Memphis Chamber of Commerce CEO and President Ted Townsend, joined xAI staff at the October 10 ceremony. The project was described as a long-needed solution for the region as it will have a treatment capacity of 13 million gallons daily, which would then be used for industrial cooling use xAI and the Tennessee Valley Authority (TVA).
This means that the facility will help conserve 5 billion gallons of potable water annually, easing demand on Memphis’ primary water system. At these levels, xAI Memphis noted that its wastewater treatment facility will feature the largest ceramic membrane MBR in the world, using 13,000 membrane modules that collectively span over 900,000 square feet, roughly the size of 16 football fields.
Construction permits have been secured for the pump station, while the main operations permit from the Tennessee Department of Environment and Conservation remains under review.
A privately funded push
The wastewater treatment facility represents a rare privately funded water reclamation initiative, with xAI covering construction costs, as noted in a Yahoo News report. The company filed preliminary plans through its affiliate CTC Property LLC in 2024, hinting at the startup’s long-term commitment to sustainable infrastructure around its growing Memphis operations. TVA CEO and President Don Moul shared his excitement for the project.
“This is a big day for Memphis, Tennessee. This initiative not only reduces our need to purchase water from MLGW for our nearby Allen Combined Cycle Plant, but it also eases demand on the region’s potable water system. By recycling water for cooling purposes, we’re helping to preserve drinking water for the community and advancing a solution that benefits both the environment and the Greater Memphis area,” he said.
News
Japan paves the way for Tesla Full Self-Driving domestic rollout
Tesla’s vehicles are allowed to be retrofitted with a software update that could enable the activation of self-driving features.
Japan seems to be taking some serious steps to pave the way for the domestic rollout of Tesla’s Full Self-Driving (FSD) system in the country.
This was hinted at by a decision from the Ministry of Land, Infrastructure, Transport and Tourism Ministry.
FSD update
As noted in a report from Nikkei, Tesla’s artificial intelligence-powered vehicles are allowed to be retrofitted with a software update that could enable the activation of their self-driving features. These features would be rolled out through an over-the-air (OTA) software update for vehicles that have already been sold to consumers.
Previous reports have indicated that Tesla Japan has started the testing of FSD technology on public roads. At the time, reports indicated that Tesla Japan employees have been conducting the tests, and the company is planning to release its FSD software to consumers in the near future, at least pending compliance with safety standards and guidelines.
New guidelines
In a comment on X, former Tesla Board Member Hiro Mizuno explained that the Ministry of Land, Infrastructure, Transport and Tourism Ministry’s decision is no small matter, as it could pave the way for the smooth rollout of features like FSD to Tesla consumers in Japan.
“The Ministry of Land, Infrastructure, Transport and Tourism’s decision to allow retrofitting of autonomous driving through software updates is significant. Currently, Tesla is the only manufacturer actively pursuing this, but I had thought that if actual autonomous driving were to begin, it would be impossible to keep up if the approval process had to be repeated for every software update. As a result, this decision will make it easier for all manufacturers to introduce autonomous driving in Japan,” he wrote in a post on X.
SpaceX is preparing to launch Starship V2 one final time
xAI’s new facility will save Memphis 5 billion gallons of water annually
Japan paves the way for Tesla Full Self-Driving domestic rollout
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