Earth at Perihelion

Today the Earth is closest to the Sun, a point called perihelion. We will be about 147,099,000km (91,403,000miles) from the Sun. Compare this to the 152,096,000km (94,508,000miles) we will be at aphelion on July 6th, a difference of about 4,996,000km (3,104,000miles) occurs throughout one orbit.

It may seem odd that we are actually at the closest for the middle of northern winter, you just have to remember that proximity to the Sun is not the cause of the seasons. The seasons are caused by the axial tilt of the Earth, creating short and long days throughout the year, with a resulting change in the angle and intensity of the sunlight.

2015 Solstices and Equinoxes
  UT HST
Perihelion Jan 4 08:59UT Jan 3 22:59HST
Vernal Equinox Mar 20 22:45UT Mar 20 12:45HST
Summer Solstice Jun 21 16:38UT Jun 21 06:38HST
Apehelion Jul 6 12:59UT Jul 6 02:59HST
Autumnal Equinox Sep 23 08:20UT Sep 22 22:20HST
Winter Solstice Dec 22 04:48UT Dec 21 18:48HST
 
Source: NASA Sky Calendar

 

Quadrantid Meteor Shower

The first meteor shower of 2015 is the annual Quadrantid meteor shower. The Quadrantids are a reliable shower, producing 60-120 ZHR, one to two meteors per minute. The Quadrantids are named for the obsolete constellation Quadrans Muralis, now part of the constellation Boötes.

Leonids in Orion
A pair of Leonid meteors streak through Orion
Unlike other showers where activity can occur for days or even weeks, the Quadrantids have a sharp peak, activity falls off rapidly on the preceding and following nights, or even a few hours away from the peak. Thus it is important to observe the Quadrantids quite near the peak prediction. For 2015 the peak is predicted for January 4th around 02:00UT, or January 3rd at 16:00HST on this side of the globe, mid-afternoon. The shower radiant in Boötes does not rise until around 2am local time. Combine the light of a full moon and poor timing and you quickly see that observing conditions are less than ideal for observing this year’s shower.

Watching meteors requires no more equipment than your eyes and a dark sky, and can be enjoyable for just about anyone. Set the alarm early? Probably not this year.

The 2014 DarkerView Review

In reading my friend Dean Ketelsen’s blog he reminded me that I have not yet assembled my usual year in review blog entry. Darker View is a blog, a web log of my life as blogs were originally invented.

As it is customary to use the new year’s holiday as a reason look back on the previous year I shall do just that. A chance to recall what adventures life has brought us, to remember the little victories, and hopefully not too many failures.

There were 434 blog entries for 2014 detailing a busy year. At least a few folks actually come by to read all of those posts, DarkerView had 69,694 view from 31,607 unique visitors. Looking through the top read posts of 2013 reveals some interesting points…

  1. Astrophotography with the EOS-M
  2. The iOptron ZEQ25
  3. Repairing a Wii Balance Board
  4. A Backyard Telescope Pier
  5. Autoguiding the iOptron ZEQ25 with an SBIG STi
  6. Starscape Photography
  7. Degrees, Arc-Minutes and Arc-Seconds
  8. SBIG ST-i Autoguider
  9. Mauna Kea Claims Another…
  10. Deep Violet, an 18″ f/4.5 Dobsonian
  11. Total Lunar Eclipse 14 April 2014
  12. Rebuilding a 12.5″ f/5 Truss Tube Dobsonian
  13. USB to ST-4 Autoguiding Adapter
  14. Canon EOS-M
  15. Rewiring a Celestron NexStar Telescope
  16. The Hotech CT Laser Collimator
  17. A Red LED Desk Lamp
  18. Shoveling Snow in a Tropical Paradise
  19. Visiting the Summit of Mauna Kea
  20. Elongations, Conjunctions and Oppositions
  21. A Second Try for the EOS-M
  22. Getting Focus Right

It is a surprise just how many of these articles were written before 2014, at least two of these articles are from the old Whitethorn House website, well over a decade old! The telescope making posts make up most of these older, well read articles. It is clear that folks are using DarkerView for reference, finding these old articles in the search engines. Hopefully they are still useful.

Removing the pre-2014 posts from the list dramatically shortens it…

  1. Starscape Photography
  2. Total Lunar Eclipse 14 April 2014
  3. The Hotech CT Laser Collimator
  4. Shoveling Snow in a Tropical Paradise
  5. Visiting the Summit of Mauna Kea
  6. Getting Focus Right

I am not sure that this is good. Is my writing falling off? Or does my older work just have staying power that it continues to serve a use for readers. This will be interesting to watch as I start another year of blogging. DarkerView is here to stay.

Happy New Year!

A few fireworks from my neighbor’s modest show. At least somewhat modest compared to many in the village. With so many families practicing oriental traditions, the amount of fireworks expended for the new year celebration is rather staggering in a Hawaiian neighborhood. Then there are the resort shows, big professional aerials, I can just see them from the front lanai. They are distant, but the sounds reverberate and they light up the low cloud deck with a colorful glow.

Wishing you a happy new year, may it bring good memories and fun adventures!
Andrew

New Year Fireworks
Neighborhood fireworks signal the arrival of 2015