Category Archives: Astronomical Event

What Ever Happened To You?

We apologize for our long absence.  As we noted in the previous column our other paying jobs and life have gotten the best of us lately.  To add insult to injury, we have been struggling with email deliverability.

We noticed that the amount of support email dropped off while our spam increased.  What we did not discover until last week was that email to us was bouncing – most of it, anyway.  We are still trying to wrestle that one down, so in the interim, please use the following email address to contact us if you have an unresolved issue.

On a positive note, if you follow Steven on Facebook, you may have noticed that he set a New Years resolution to lose 35 pounds in the year. So far he’s lost 26 pounds, far out stripping his two month goal of being 10 pounds slimmer. His plan is pretty simple, track and limit calories (using an App on his phone) to 1550 per day.  It’s been working well. Now if only he could figure out how to finish income taxes, get email fixed, and a dozen other tasks he would be in great shape.

Eclipse Alert

There is a Total Lunar eclipse coming the morning of April 4th.  Maximum is from 4:57 to 5:02 AM in California. That means it may be possible to get the moon in the shot near the horizon, but it will be at an altitude of 15 degrees. Getting the large moon effect at totality will be easier than the last eclipse, but still a bit of a challenge.  See the previous column for some tips.

The Vicissitudes of Life, Photography and Weather

If vicissitude is a long word, do not worry. It means:

a change of circumstances or fortune, typically one that is unwelcome or unpleasant.

Here in California we are finally getting much-needed rain.  The drought has been more severe than when we moved here 25+ years ago. Showers and clouds are quite welcome in these parts, provided they do not block out the next great celestial event.

The next great shower is the Geminids on the night of December 13th into the morning of December 14th.  Fortunately that is a weekend, unfortunately the moon is in its last quarter so it will rise near midnight just as the shower generally becomes more intense.

Meteor in Pointy Land

How to Watch a Meteor Shower

There are many guides on what to do to SEE a meteor shower, but we can boil it down for you:

  1. Dress very warmly. A thermos of hot beverages is strongly recommended.
  2. Get in as dark a sky as possible away from sources of light pollution, streetlights, etc. Do not use a flashlight. Let your eyes dark adapt so they can see their best.
  3. Get a comfortable fully reclining chair and look STRAIGHT up.  You’ll see more meteors if you can see the entire sky. While the meteors will appear to come from the constellation Gemini they can appear anywhere in the sky.
  4. Bring a friend along and share the wonders of the heavenly fireworks with them. Besides, officially you didn’t see a meteor unless two people saw it or you got a photograph 🙂

The constellation Gemini – from which all the meteors of the shower appear to radiate rises at about 7:30 PM local time in the North East.  At that time, the Andromeda Galaxy will be almost straight above you for most people in mid-northern latitudes. By midnight, Gemini will be overhead. We recommend a Planisphere or an app if you want to identify the constellations, but to enjoy the shower you need nothing but your eyes.

Photographing a Meteor Shower

In prior articles have covered how to find a dark location and how to plan for and photograph a meteor shower.  And we even have a thorough article that explains why you probably DID NOT photograph a meteor.  We even have led expeditions to capture meteor showers in a dark location.  Unfortunately this year we have faced other vicissitudes.

You can safely skip the rest of this article if you wish…

Showers in Life

We could not deliver the content you requested used too many times

Download link error – hopefully resolved now.

We have weathered several storms ourselves recently, and like you find ourselves wondering where all the time went.  Most recently we were reminded how difficult it can be to maintain a website and sell digital goods. An increasing number of customers complained that the digital goods they ordered could not be downloaded.  We discovered that Google was the problem! We had been using goo.gl to create short links instead of long, sometimes multi-line links for downloading content, but Google insists – for your safety – to check the contents of each of those links.  It would have been fine had this happened once or twice, but we noticed that Google US, Google Czechoslovakia, Google Japan, and Google Brazil (and others) all separately scanned the links, sometimes multiple times.  And then your virus scanner may also have downloaded and inspected the content before it would let YOU have it…  It was a lot of wasted bandwidth and irritation. We rejiggered our software to resolve the issue. Bottom line if you recently purchased content and got a “Too Many Download Attempts” message, we think it should now work if you try again. We apologize for any inconvenience.

Also, as you may know, running a website is not for the faint of heart. For example, we are seeing another increase in attacks from Chinese Comment Spam robots as well as attackers in the countries of Georgia and Germany.

On a personal matter, Steven – the primary contributor to this website – was the sole survivor of an entire team that was laid off at his day job. Steven was fettered with sole responsibility for a vast armada of servers and networks – which all fell on their knees when a 30 second power interruption wreaked havoc. He also found that there were problems with his own home network which he has been building to be able to conduct webinars again (and to thwart robocallers) … His home network is still not reliable enough, unfortunately!

Meanwhile, we are still working hard on our 2015 schedule of events.  Please bear with us. Our next article will be about pin-point stars in landscape astrophotography.

~ Steven

 

Geometry and The Moon

Please do not run away. We are about to use adult language here. For example we will be using the word trigonometry. Still here? Good.  Here is a very pedestrian looking lunar eclipse photo taken with a 280mm lens*, cropped.

Near and Distant Neighbors

Very Ordinary Photo of the Lunar Eclipse with the planet Uranus in the lower left.

This past lunar eclipse several of us put our heads together to try to come up with a more creative photo than the one above. We had a trigonometry problem, however. On the West Coast the last moment of totality occurred at 4:24 AM PDT. We were brave enough to be out at any time of night – even if it meant extreme sleepiness in our day jobs but our problem was that the lowest the moon would be in the sky at the last bit of totality was 32.6 degrees above the horizon. We determined that angle using Stellarium, by the way. Unfortunately there is pretty much nowhere to go to get a nice large moon near an interesting object when the moon is almost 33 degrees high.

Wait: Why do we want the moon and the object to be similarly sized? Here is why… we want the moon to be noticeable like the Fantasy version below, not merely “present” like the real photo on the right. Even bigger would be better, right!?

N_281-608714+C_281-8150

Notice above right (Reality) and below how tiny the moon is compared to the building in the foreground?  Indeed, if you see a photo taken from anywhere on the West Coast where the eclipsed moon is significantly lower in the sky or larger than shown against foreground, you know it has been “photoshopped“.

Plan C: San Jose City Hall Eclipse Sequence

In short, it is nigh impossible to get the large moon effect with an altitude (angle) of 32 degrees here is why:

Calculating the Angles

Calculating the Angles

Just how far away do we need to be in order to get the moon the same size as an object of interest:

114.6 x object size

In other words, an object that is one foot tall, requires us to stand 114.6 feet away to make the 1/2 a degree angular size of the moon the same angular size as that 1 foot tall object.  The number “114.6” is from this calculation:

1 / TAN (0.5 degrees)

Yeah, that is trigonometry. Using still more trigonometry it is possible to calculate how high above the horizon a 9 inch tall object has to be so that it is “moon sized”.  We did that for you in the “Calculating the Angles” diagram above. Once you calculate the distance from the camera of 85.9, you can multiply that by the sine of the angle to calculate a height of about 46 feet! Here is the trigonometry:

Height = 85.9′ * SIN (32 deg)

You can go one step farther and calculate the distance from the object with ‘distance = 85.9 * COS(32 deg)’.

Of course after all that calculating you will still need to find a location, have contingency plans for weather and so on. At StarCircleAcademy we have built some tools and put together materials to help in all these endeavors.  We teach these things in our NP111 Catching the Moon Webinar.

The Road To The Temple

Below is where we ended up. This image is from our friend and co-conspirator Andy Morris.

Lunar Eclipse over Temple by Andy Morris of PhotoshopScaresMe

Four of us plotted and schemed to get an interesting shot. Above is Andy Morris’ result.  Click the image and you can read a great article about how he created the shot using Photoshop Skills at his site: PhotoshopScaresMe.com. In fact, it’s a great article which we strongly encourage you to read. You’ll learn how he composited the images together in Photoshop as layers.

The Long Conversation to Pick a Location

Andy has more details including how alcohol played a part in the process. Mostly I, Steven, was the wet blanket explaining why the geometry was all wrong.

  • The Stanford (Hoover) Tower looks like it is shrouded in trees from the needed angle
  • Bank of Italy (formerly BofA) in SJC doesn’t work
  • The main problem with the wind turbines is that the angle to the top of them is something around 12 degrees above the horizon which is 40 moon diameters below the eclipse.
  • Here is why the GG Bridge doesn’t work…
  • This seems to be the best solution I could find: the Coit Tower…
  • Darn. It would appear the coast is out. Forecast calls for Fog from SF to HMB
  • This might make an interesting foreground (see below)… Somebody want to check if they will mind us being on their property in the wee hours?

*Ok, we lied, it was actually a 70-200mm lens with a 1.4 TC on a full frame camera, but the net is the same: 280 effective mm focal length.

Where did you go and what did you get in your planning efforts?  Post a comment and link below… we’d love to see what you came up with!

What is so Super about a Super Moon?

August 10, 2014 just passed. It was the most recent Super moon. The term “Super moon” was coined by astrologers not astronomers and refers to a moon which is both full and also within 4 hours of its closest approach to earth.

The media gleefully report the super moon and show pictures of huge moons (many of which have been photo manipulated).  Here is the straight scoop on the subject. If you’re wondering whether that photo you’ve seen of the “too big to be true moon” has been doctored, we have an article on that.

Extreme SuperMoon [5_059193]

The most “Extreme” Supermoon of the Century occurred in 2012.  Here it was photographed in Yosemite approximately 15 minutes after it reached perigee.

What Makes the Moon Larger or Smaller When Seen from Earth?

Because the orbit of the moon around the earth is not circular, the distance from earth to the moon varies and thus the apparent (angular size) of the moon changes. Every lunar cycle the earth-lunar distance varies between its closest approach called perigee and its farthest distance, called apogee.  How big is the difference? The closest approach is 363,104 km (225,622 miles) and the farthest, 406,696 km (252,088 miles). 

What is the difference in apparent size?  At apogee, the moon is 22,293 km farther away or -5.8% smaller than an average moon.  At perigee the moon is 5.54% larger than the average moon. Comparing apogee and perigee moons, the difference is a maximum angular size difference of about 12%  The average angular size of the moon, by the way, is half of a degree or 30 minutes of arc. That angle is slightly smaller than the size of the nail on your little finger when held at arm’s length. Those of you with significantly mis-sized pinky nails or unusual arm length might want to find another object to measure with at arm’s length.

In short: You’d have to be a very keen observer to notice a 12% difference in size between a super moon and a “wimpy” (apogee) moon.

Because the moon is slowly spiraling away from earth eventually the perigee moon will grow smaller and smaller in apparent size until one day, we will no longer experience total solar eclipses. The perigee moon will be too small to cover the angular disk of the sun which also happens to be almost exactly one half of a degree. From that point on, all solar eclipses will be “annular” like this one in May, 2012. Had the moon been closer to the earth, this may have been a total solar eclipse.

Annular Eclipse Sequence [C_040079+5s]

 

 

How is a Full Moon Determined?

A full moon is defined as the moment in time when the sun, earth and moon are in syzygy. Syzygy is not only an interesting Scrabble(tm) word, but it defines when three bodies are in alignment. When the sun and moon are 180 degrees opposite one another relative to the Earth, we have syzygy which is the instance in which the moon is Full Moon. Many of us think of a “full moon” as that period during the month when the moon appears to be fully lit. That period lasts almost 70 hours, so we understand how reckoning a full moon as a moment in time is a bit confusing.

If you didn’t observe the August moon within 4 hours either side of when it was full, you did not see the super moon.  On the United States West Coast the super moon was not visible. Why? The moon set at 6:10 AM almost 5 hours before the moon was full. Those in Hawaii could just catch the super moon setting.  Those on the East Coast of the US had no chance at all. The whole super moon window occurred during the time the moon was not visible on the East Coast.

The Last (and Next) Visible Super Moons

If you missed the May, 2012 Extreme Super Moon (my term, photo above), you’ve missed the largest possible full moon for more than a century into the future. On May 5, 2012 fullness and perigee occurred within less than two minutes of one another.  But don’t fret.  The difference in size between the extreme super moon an the average super moon is too small to notice unless you measure carefully.  If you paid close attention you probably also noticed that the May 20, 2012 annular solar eclipse followed nearly half a lunar cycle after the May 5, 2012 super moon. That is not a coincidence! The moon was closest to us on May 5th so half of a lunar cycle away it must be farthest from us!

On August 10, 2014, full moon and perigee occurred within about 1 hour of each other. The next super moon is in September 8, 2014. The moon will not be as close to perigee at the moment when it becomes full, but the moment of full moon occurs at 9:38 PM PDT, just as the moon rises. It will be a true super moon!

Catch One Yourself

We plan to schedule a “Catching the Moon” Webinar well in advance. Stay tuned.  One complication is that the wonderful Photographer’s Ephemeris Tool will cease to work in desktop mode soon. It is being replaced with a browser version. While the tools is excellent, and we highly recommend it (and that you donate if you use it!) TPE still leaves some important bits of the puzzle unresolved – we will fill those in for you and give you a crack at our tool(s).

The moon caught between El Capitan and Half Dome - Actual size, no manipulation

The moon caught between El Capitan and Half Dome, Yosemite National Park – Actual size, no manipulation