APOD: Sunset Analemma (2019 Jun 21)

Comments and questions about the APOD on the main view screen.
User avatar
APOD Robot
Otto Posterman
Posts: 3608
Joined: Fri Dec 04, 2009 3:27 am

APOD: Sunset Analemma (2019 Jun 21)

Post by APOD Robot » Fri Jun 21, 2019 4:14 am

[img]https://apod.nasa.gov/apod/calendar/S_190621.jpg[/img] Sunset Analemma

Explanation: Today, the solstice is at 15:54 Universal Time, the Sun reaching the northernmost declination in its yearly journey through planet Earth's sky. A June solstice marks the astronomical beginning of summer in the northern hemisphere and winter in the south. It also brings the north's longest day, the longest period between sunrise and sunset. In fact the June solstice sun is near the top, at the most northern point in the analemma or figure 8 curve traced by the position of the Sun in this composite photo. The analemma was created (video) from images taken every 10 days at the same time from June 21, 2018 and June 7, 2019. The time was chosen to be the year's earliest sunset near the December solstice, so the analemma's lowest point just kisses the unobstructed sea horizon at the left. Sunsets arranged along the horizon toward the right (north) are centered on the sunset at the September equinox and end with sunset at the June solstice.

<< Previous APOD This Day in APOD Next APOD >>

Elias Chasiotis
Ensign
Posts: 40
Joined: Tue Aug 04, 2009 11:59 am

Re: APOD: Sunset Analemma (2019 Jun 21)

Post by Elias Chasiotis » Fri Jun 21, 2019 5:40 am

This interactive picture is also very interesting: https://greenflash.photo/portfolio/suns ... ce-sicily/

gioyhofer
Asternaut
Posts: 6
Joined: Sat Feb 07, 2015 10:04 pm
Location: Valle di Cadore

Re: APOD: Sunset Analemma (2019 Jun 21)

Post by gioyhofer » Fri Jun 21, 2019 6:57 am

Great Job Marcella Giulia pace

User avatar
Joe Stieber
Science Officer
Posts: 158
Joined: Tue Aug 18, 2009 1:41 pm
Location: Maple Shade, NJ

Re: APOD: Sunset Analemma (2019 Jun 21)

Post by Joe Stieber » Fri Jun 21, 2019 8:55 am

This is the first time to my knowledge that a person has the APOD and the EPOD simultaneously, with almost the same picture. See today’s EPOD (Earth Science Picture of the Day) at...

https://epod.usra.edu/blog/2019/06/suns ... noxes.html

User avatar
neufer
Vacationer at Tralfamadore
Posts: 16089
Joined: Mon Jan 21, 2008 1:57 pm
Location: Alexandria, Virginia

Re: APOD: Sunset Analemma (2019 Jun 21)

Post by neufer » Fri Jun 21, 2019 10:00 am

Click to play embedded YouTube video.
Joe Stieber wrote:
Fri Jun 21, 2019 8:55 am

This is the first time to my knowledge that a person has the APOD
and the EPOD simultaneously, with almost the same picture.
Marcella Giulia made them an offer they couldn't refuse.
Last edited by neufer on Fri Jun 21, 2019 10:23 am, edited 1 time in total.
Art Neuendorffer

Boomer12k
:---[===] *
Posts: 2531
Joined: Sun Apr 22, 2007 12:07 am

Re: APOD: Sunset Analemma (2019 Jun 21)

Post by Boomer12k » Fri Jun 21, 2019 10:22 am

A very nice, and interesting take...

:---[===] *

User avatar
bystander
Apathetic Retiree
Posts: 18570
Joined: Mon Aug 28, 2006 2:06 pm
Location: Oklahoma

Re: APOD: Sunset Analemma (2019 Jun 21)

Post by bystander » Fri Jun 21, 2019 11:03 am

Click to play embedded YouTube video.
ANALEMMA AND AMPLITUDE OCCASIVE FROM SICILY - 2016/2019
Video: Marcella Giulia Pace (www.greenflash.photo)
Music: "3 of 3" by Paolo Battaglia
Know the quiet place within your heart and touch the rainbow of possibility; be
alive to the gentle breeze of communication, and please stop being such a jerk.
— Garrison Keillor

User avatar
orin stepanek
Plutopian
Posts: 4880
Joined: Wed Jul 27, 2005 3:41 pm
Location: Nebraska

Re: APOD: Sunset Analemma (2019 Jun 21)

Post by orin stepanek » Fri Jun 21, 2019 12:37 pm

Hi: By! I can't get your video for some reason! Sound is there but picture is blocked! :cry:
Orin

Smile today; tomorrow's another day!

E Fish
Ensign
Posts: 54
Joined: Thu Mar 09, 2017 2:29 pm

Re: APOD: Sunset Analemma (2019 Jun 21)

Post by E Fish » Fri Jun 21, 2019 1:11 pm

Joe Stieber wrote:
Fri Jun 21, 2019 8:55 am
This is the first time to my knowledge that a person has the APOD and the EPOD simultaneously, with almost the same picture. See today’s EPOD (Earth Science Picture of the Day) at...

https://epod.usra.edu/blog/2019/06/suns ... noxes.html
I had just seen that myself and was going to comment on it. Same location, same purpose, just a slightly different picture.

JimThomas

Re: APOD: Sunset Analemma (2019 Jun 21)

Post by JimThomas » Fri Jun 21, 2019 1:35 pm

I assume those are white dots added to where the sun was determined to be at that time and not an image of the sun itself, which would require perfect weather conditions every time a picture was taken.
Impressive and informative nonetheless, whatever the technique used to create this image.

Alietr
Asternaut
Posts: 7
Joined: Mon Jul 09, 2007 11:26 am

Re: APOD: Sunset Analemma (2019 Jun 21)

Post by Alietr » Fri Jun 21, 2019 1:46 pm

Note cat on wall.

gioyhofer
Asternaut
Posts: 6
Joined: Sat Feb 07, 2015 10:04 pm
Location: Valle di Cadore

Re: APOD: Sunset Analemma (2019 Jun 21)

Post by gioyhofer » Fri Jun 21, 2019 2:03 pm

You can see all shots here:

https://greenflash.photo/?da_image=suns ... r-solstice

Extraordinary job

User avatar
Chris Peterson
Abominable Snowman
Posts: 14427
Joined: Wed Jan 31, 2007 11:13 pm
Location: Guffey, Colorado, USA

Re: APOD: Sunset Analemma (2019 Jun 21)

Post by Chris Peterson » Fri Jun 21, 2019 2:06 pm

JimThomas wrote:
Fri Jun 21, 2019 1:35 pm
I assume those are white dots added to where the sun was determined to be at that time and not an image of the sun itself, which would require perfect weather conditions every time a picture was taken.
Impressive and informative nonetheless, whatever the technique used to create this image.
I would assume that each dot is an actual image of the Sun. Certainly, from that location, I'd expect little problem in acquiring that many images with clear skies.
Chris

*****************************************
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com

User avatar
orin stepanek
Plutopian
Posts: 4880
Joined: Wed Jul 27, 2005 3:41 pm
Location: Nebraska

Re: APOD: Sunset Analemma (2019 Jun 21)

Post by orin stepanek » Fri Jun 21, 2019 2:42 pm

Works now; nice! :D 8-)
Orin

Smile today; tomorrow's another day!

Elias Chasiotis
Ensign
Posts: 40
Joined: Tue Aug 04, 2009 11:59 am

Re: APOD: Sunset Analemma (2019 Jun 21)

Post by Elias Chasiotis » Fri Jun 21, 2019 2:46 pm

On the EPOD merged image there are many cats on the wall (obviously it's the same cat in different position at each capture).
You do not have the required permissions to view the files attached to this post.

Sam
Science Officer
Posts: 155
Joined: Thu Aug 19, 2010 8:39 pm

Re: APOD: Sunset Analemma (2019 Jun 21)

Post by Sam » Fri Jun 21, 2019 3:26 pm

I love this APOD! Once tried to create something similar but never got around to figuring out how to process a year's worth of photos. Congratulations Marcella!
"No avian society ever develops space travel because it's impossible to focus on calculus when you could be outside flying." -Randall Munroe

geoffrey.landis
Ensign
Posts: 47
Joined: Thu Aug 20, 2009 3:49 pm

Re: APOD: Sunset Analemma (2019 Jun 21)

Post by geoffrey.landis » Fri Jun 21, 2019 6:17 pm

I do have to say I found this one confusing and hard to follow. The sun seems to be doing the usual analemma thing.... then abruptly takes a right-angle turn in the sky.
This is not a composite of the analemma; it is the analemma composite overlaid with a bunch of mostly-unlabelled sunset positions, AND a sunset sequence every five minutes on June 21, and ANOTHER sunset sequence every five minutes on Sept. 23-- four different composites on the same image (which explains the right-angle turn: it's a different composite.)

heehaw

Re: APOD: Sunset Analemma (2019 Jun 21)

Post by heehaw » Fri Jun 21, 2019 7:59 pm

Wouldn't it be fun to have an analemma with Daylight Savings Time sections?