August 12, 2026 Solar Eclipse

It's Eclipse Season, that magical time when the Sun, Moon and Earth line up to remind us of how special we are here on planet Earth ... because we are the only planet in our Solar System that has a Moon that perfectly covers our Sun. Every six months the two distant bodies align and give us eclipses, sometimes lunar, sometimes solar, sometimes partial, sometimes total. 

On August 12, 2026 we will have a Total Solar Eclipse visible from a narrow band that stretches from the North Pole through Greenland and Iceland, across the North Atlantic Ocean, and then across Portugal, Spain and the Balearic Islands. And for 100s of millions of people across Europe, they will experience a dramatic partial eclipse at sunset. The image (above) shows how it will look for many observers. 

There are many factors to consider when viewing an eclipse, from timing to weather to eye safety. My latest Translunar podcast recording entitled The Sunset Solar Eclipse covers all of this and more. 

This page on Instagram from the creators of the Star Walk App is a very fine summary of what to expect from different locations across Europe. Good luck with this eclipse and I'll send my report from the Balearic Islands (specifically Mallorca). 

The Spring 2015 Eclipse Season

We are in an Eclipse Season, a period of time approximately every six months when we experience 2 or 3 eclipses in a short period of time. Just a few days ago Europe experienced a Total Solar Eclipse far in the north of the continent, and by coincidence I was in the region on a business trip and experienced a partial eclipse. Being there reignited the love I have for eclipses and now that I am back in San Francisco, I am counting down the days to the next Total Lunar Eclipse on the early morning hours of April 4th. This is the third in a 'Tetrad of Total Lunar Eclipses' that started in 2014 and conclude later this year.

Lunar Eclipse April 4

The upcoming Lunar Eclipse will be visible from the west coast of the United States in the pre-dawn hours, starting at 3:17 AM and reaching totality from 4:58 until 5:03 AM. This should be a unique eclipse due to the very short duration of totality. As the Moon will barely be fully engulfed in the umbral shadow of Earth, the color will likely be quite unusual. The past few Lunar Eclipses have produced 'blood red' Moons, but I expect this one will be a more shallow shading with more light on the limb of the Moon and not the dark or ruddy color that is often seen during totality. I look forward to a high-speed Lunar Eclipse. In many ways it will be reminiscent of a Total Solar Eclipse, in that we will only experience a tantalizing short few minutes of totality - something I am quite used to when it comes to Solar Eclipses, but not used to for Lunar.

The San Francisco Amateur Astronomers are planning a public viewing event at Ocean Beach in San Francisco on April 4th. Come join us for a fun time viewing this unique eclipse at the beach.

Image courtesy Fred Espenak.

Partial Lunar Eclipse of June 2012

Early in the morning hours of Monday June 4, west coast viewers will witness a partial lunar eclipse. This follows the dramatic Ring of Fire Solar Eclipse by roughly two weeks, the interval from a New Moon (with the Moon causing the solar eclipse) to the Full Moon (with Earth causing the lunar eclipse). These are two events in an Eclipse Season, and as should be expected, if one event is really great (the annular solar eclipse) the next will be less impressive (just a partial lunar eclipse).

Nonetheless, it's always a treat to see an eclipse of the Moon, and this one will be a nice sight, starting at 3:00 am for viewers in the pacific time zone, peaking around 4:00 am, and ending around 5:00 am as the light of dawn starts to break. EarthSky has some good images.

Image courtesy Wikimedia Commons.

Moon in Descent

The Moon traces out a path across the sky that is slightly offset from the path of the planets and Sun (the well-known "ecliptic" path). The orbit of the Moon is inclined to the ecliptic by 6 degrees, meaning that at any given point in a month, the Moon might be found in the sky just at the ecliptic, or moving below the ecliptic (up to 6 degrees away from it), or above the ecliptic. As it travels in its 29 day journey around the Earth, the Moon passes through the ecliptic twice, once going down (descending node) and once going up (ascending node).

Since we just finished an Eclipse Season, the Moon's nodes are very near to the points in space where we have New Moon and Full Moon, enough that from the New Moon a few days ago, to the First Quarter Moon later this week, we see the Moon traveling past the descending node and moving well below the ecliptic. Visual proof of that this week comes in the form of Saturn and Spica (see image), both of which are nearly on the ecliptic. The daily change in location of the Moon shows us just where the Moon is in relation to the ecliptic, this week skirting just south (below) this imaginary line in space.

Eclipse Season: Three Solar and Lunar Eclipses all in a row

For most people it is a surprise to learn that Solar and Lunar eclipses are quite frequent events. Every six months we have an "Eclipse Season" in which we have two or sometimes three eclipses over the course of a few weeks, depending on the exact geometry of the Sun-Earth-Moon trio. June is one of these months, starting with a Partial Solar Eclipse (today), then a Total Lunar Eclipse mid-month, and finishing with a Partial Solar Eclipse (actually in July, but just hours after the end of June!).

Eclipses are indeed common for Planet Earth, but for a given fixed location on the planet, eclipses are less common. For example, the first eclipse (Solar) of June is visible only from the very far north regions of the planet. The Total Lunar Eclipse mid-June will be visible primarily in the eastern hemisphere, so for those of us in San Francisco, it will take place during the day when we cannot see the Moon. And the final (Solar) eclipse of this eclipse season will be visible only in a small region of the globe deep in the southern hemisphere.

Eclipses come in "seasons" because they can only happen when the Moon is precisely positioned to cast its shadow on the Earth, or when the Moon passes precisely through the Earth's shadow. As the Moon's orbit is not exactly aligned with the Earth's orbit, the two orbits (and shadows) come into alignment for a few weeks every six months. The rest of the time, the shadows of the Moon and Earth miss each other and we are eclipse-free!

Since eclipses are such dramatic events, when they are visible in your area, you should go out of your way to see them. For us in California, the next good eclipse will be a Total Lunar Eclipse on December 10th. More on that when the date draws nearer.

Meanwhile, if you want to know more about upcoming eclipses, visit the excellent on-line resource from NASA. The NASA Eclipse Web Site is filled with detailed information about solar and lunar eclipses, including maps, charts, and exact timing for each event. Another excellent resource is the EarthView Eclipse Network. The image (above) is courtesy of the EarthView Eclipse Network.

Star-and-Planet Drama

The evening sky over the next few weeks offers a study in the changes that take place in the sky along the path of the Moon and the path of the planets. This is exciting to watch and helps to unveil some of the intricacies of the Solar System, something you can see right from your own backyard. For quite a while now I have been particularly fond of sharing the path of the planets across the sky (the "Ecliptic") while conducting star parties and giving astronomy talks. I find that the ability to visualize this band across the sky is an important one for those who wish to have a basic understanding of the motion of the planets across the sky. And for several months the bright planets, a collection of bright stars, and the monthly sweep of the Moon across the sky have provided a perfect laboratory for learning. This month is no exception.

Shortly after sunset there is an excellent parade of planets and stars easily visible as the glare of dusk fades, starting with brilliant Venus in the west, and then in succession from west to south are Regulus, Mars, Saturn and Spica. These bright objects show the line of the Ecliptic.

At the end of this week there is a total solar eclipse (unfortunately not visible

from the San Francisco Bay Area). The eclipse comes at the middle of an Eclipse Season and as such, the Moon follows a descending path below the Ecliptic in the days that follow the eclipse, in particular from the 12th to the 17th of July. As it moves from day to day, it swoops just below the Ecliptic and makes a pleasant arc across the southern sky below Venus and Regulus, then Mars, then Saturn and then Spica.

And in addition, we are just coming into a period of time when fast-moving Venus has close encounters with the other planets and stars along the Ecliptic, starting with a close encounter of Regulus on the 9th of July. More drama to come in the next few weeks -- stay tuned!

The Path That Leads to the Earth's Shadow

We are in an "Eclipse Season," a five week period of time when the Moon's orbit around the Earth is aligned in a way that the Full or New Moon crosses the path of the Earth around the Sun. When that happens, we experience a Lunar or Solar Eclipse and right now we have one of each coming up: a partial Lunar Eclipse on Saturday 26th, and a total Solar Eclipse on July 11th. The Solar Eclipse will not be visible from North America so we don't get a chance to experience that, but the Lunar Eclipse will be. More on that next week.
During an Eclipse Season, the Moon's position in the sky is special, as it is moving just above or just below the plane of the planets (the "Ecliptic") in the interval from New Moon to Full Moon. A few days ago as the Moon emerged from the evening glare waxing each evening, you could see it move just below Venus, then below Regulus and Mars, and now it is below Saturn and Spica, all objects on or near the Ecliptic. As it nears Full Moon and the Lunar Eclipse on the 26th, it is moving closer and closer to the Ecliptic and will intersect the Earth's shadow on the 26th.
I like to imagine that there is a dark spot in the sky where the Earth's shadow projects out into space. Every month as the Moon nears Full, it sweeps close to that spot. But only during an Eclipse Season -- every six or twelve months -- does it slip into the shadow of the Earth and display to all of us the curved shadow of the Earth. That is something to look forward to next weekend.