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Free Lecture 04: Moon Phases and Eclipses

The lecture video is embedded below but also available here in MP4 format.
Additionally, slides used in the lecture are embedded below but also are available here in Powerpoint format.
Questions after the lecture? Please ask them in here.

Wikipedia entries:
Lunar phase
Diurnal motion
Celestial pole
Solar Eclipse
Lunar Eclipse


Standing on a high pole, you observe,
Falling down badly, do you accept?,
Flying above the clouds, you deserve,
Crawling on the ground, do you accept?,
Running endlessly for hours, you exhale,
Stopped by obstacles, do you accept?,
Always wishing to win, you prevail,
Failed by “almost”, do you accept?,
Dreaming of becoming an icon, you sleep,
Waking up to reality, do you accept?,
Searching ‘out’ for answers, you go deep,
Finding within yourself, do you accept?,
Doubting every word, you question,
Questioning yourself, do you accept?,
Building an object, you go for precision,
Errors in skill, do you accept?,
Framing out conclusions, you are relevant,
Hearing the odds, do you accept?,
Creating new ideas, you are intelligent,
Lacking the space to put it in, do you accept?,
Thinking of good for all, you are kind,
Finding yourself rejected, do you accept?,
Breathing slowly, you relax your mind,
Realizing the truth, do you accept?,
Learning with curiosity, you are glad,
Drowning in doubts, do you accept?,
Losing someone special, you are sad,
Ready to move on, do you accept?,
Of all that you see is good in you, you accept,
Ignoring the other side that’s hard to expect,
Fake percept and unstable concept, you respect,
But the reality of life, DO YOU ACCEPT???

©Varun K. Sharma

Our Ignorance has lead us to chaos. It’ time to wake up. Check out this beautiful poem. Original post is here

Centaurus A : A beautiful Galaxy

Galaxy Centaurus A, in X-ray

Galaxy Centaurus A, in X-ray (Photo credit: Wikipedia)

Centaurus A (also known as NGC 5128) is a prominent galaxy in the constellation of Centaurus. There is considerable debate in the literature regarding the galaxy’s fundamental properties such as its Hubble type (lenticular galaxy or a giant elliptical galaxy) and distance (10-16 million light-years).NGC 5128 is one of the closest radio galaxies to Earth, so its active galactic nucleus has been extensively studied by professional astronomers. The galaxy is also the fifth brightest in the sky,making it an ideal amateur astronomy target, although the galaxy is only visible from low northern latitudes and the southern hemisphere. Credits : Wikipedia

I think  this video needs to be shared. Showing galaxies or other interesting celestial objects in multiple wavelengths is a superb job. I wonder there’s more in reserve for us by ESA.

But a deep sky object like NGC 5128 could also be seen by amateur astronomers and with the right tools and some stacking you can have a marvellous  image. What made me amazed is you could have this beautiful image with an 8″ dobsonian. ( This image is by an 8″ newtonian, but for me it’s the same) A perfect debutante telescope.

Centaurus A Gradient Removed

Credits: split_city @

First attempt at Centaurus A.

Scope: 8″ Newt
Mount: EQ6
Camera: unmodded Canon 400D
Exposures: 25x60secs unguided
Stacked in DSS and processed in CS3

This is a cropped version. Focus slightly off and stars a little elongated.

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