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“The debt to our ancestors for the observations they made to our benefit, we can pay only by doing the same for our ancestors.”
- Ejnar Hertzsprung, 1961
“Since 31st July 2018, we have been a member of AAVSO (American Association of Variable Star Observers).
We mainly observe the Sunspots & Variable Stars & report their brightness to AAVSO.
Our 900th Sunspot Observation completed on April 2025”
- Er. Aritra Das (DARB)
"The sun, with all those planets revolving around it and dependent on it, can still ripen a bunch of grapes as if it had nothing else in the universe to do."
Galileo Galilei
Sunspots are temporary phenomena on the Sun's photosphere that appear as spots darker than the surrounding areas. They are regions of reduced surface temperature caused by concentrations of magnetic field flux that inhibit convection. Sunspots usually appear in pairs of opposite magnetic polarities.
Here we observed the Sun on 22nd December 2024 with 11 Prominent Sunspot group which consisted of 44 spots (as viewed from Kanchrapara, North 24 Parganas, West Bengal, India by Er. Aritra Das). The resultant Wolf Number calculated as 154.
"...it is a fact that only by the observation of variable stars can the amateur turn his modest equipment to practical use, and further to any great extent the pursuit of knowledge in its application to the noblest of the sciences".
-Tyler Olcutt, AAVSO founder and first Secretary in Popular Astronomy, March 1911
All the white dots in the sky are stars (some of them are planets though), and most of them are variables. Their brightness varies from time to time. There are several reasons why they vary but the most important thing is that every variation tells us a unique story. These stories are the documents of their livelihood. How they evolve, how they die. That's where those stars are more human to us than some of the humans we are living with. On every dark night, we look up & hear their stories, trying to understand them with Scientific values.
HR Diagram of Stars
Join us to observe the celestials through our
reflective Newtonian Telescope with Dobsonian Mount
GIORDANO BRUNO
Jan/Feb 1548 - 17 Feb 1600
Bruno died for us.
He is the first Martyr of Science in the hands of religious fanatics.
He proposed that the stars were distant suns surrounded by their own planets, and he raised the possibility that these planets might foster life of their own, a cosmological position known as cosmic pluralism. He also insisted that the universe is infinite and could have no "center".
"Truth does not change because it its, or is not, believed by a majority of the people."
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