International SUN-day 2015

International SUN-day 2015 
at BRESSER and LUNT Europe

Sunday, June 21, 2015 
From 10 - 18 o'clock 
Gutenbergstr. 2 
46414 Rhede 

After the great success of last year's event, the nonprofit Charlie Bates Solar Astronomy Project (CBSAP) is calling on all solar observers for another global celebration of our nearest star.

From amateur astronomers to professional scientists, events are being organized for our life-giving star and are planned worldwide on that day. Objective will once again be to share the fascination of the sun.

BRESSER and LUNT are once again partners of this international project and we cordially invite you to our event on 21 June. We will setup numerous solar telescopes of Lunt Solar Systems with which the general public can glimse a view of the sun. Of course solar observers are invited to bring their own solar telescopes of any brand to our location.

Darüber hinaus bieten wir Ihnen zahlreiche weitere Attraktionen SUN-Day

Tag der offenen Tür bei BRESSER

Besichtigen Sie eines der führenden Unternehmen der Optik-Branche. Und am International SUN-Day bietet BRESSER allen Besuchern 15% Rabatt auf alle Teleskope, Mikroskope, Ferngläser, Wetterstationen und viele weitere Produkte. Dieses Angebot gilt selbstverständlich auch für die Sonnen-Teleskope von Lunt-Solar-Systems.

Wissenswertes zur Sonne

Am 21. Juni können Sie bei uns auch wissenswertes und faszinierendes über die Sonne erfahren. Wir werden Fachleute hier vor Ort haben, die in multimedialen Vorträgen verschiedene Aspekte der Sonne anschaulich nahebringen.


Das IUZ Bochum und die Firma Tekloth-Solartechnologie demonstrieren die Nutzbarmachung der Sonnenenergie. Von Experimenten und solarbetriebenen Elektroscootern für Kinder, bis hin zu kommerziellen Solar-Panels

What is the nearest star? Proxima Centauri?

Sun through LS100THa and B3400

No, it is our sun!


Amateur astronomers admire and observe the starry night sky. But for these you have to be awake all night and therefore most people only have enough time for this hobby on the weekends. And the stars themselves can not be really observed in detail. No matter how big the telescope is, a single star will always be only a small point.

Our sun is the only exception. The sun is easy to observe during the day, and it is close enough to see clearly the fascinating details. And, it is not like many other objects in the sky, you see not always the same aspect. The sun is almost alive, it can surprise us daily with new events, sometimes it will be even only a matter of minutes. There is much more than only the famous sunspots. Powerful eruptions, known as prominences, rise up from the edge of the sun and fall back dawn on the surface finally. Also the surface itself is generous with exciting effects, like turbulences, flares, and filaments. Unbelievable enormous quantities of vibrant energy, directly before your eyes.

But how can you see all this? With conventional solar filters that only dim the light very strong, you can observe the sun only in the so-called “White-Light”. Here, however, are only the sunspots visible, and if you are lucky a little bit of the granulation on the solar surface. For the really exciting effects you need involved high-tech filter that allows observing the sun in a single, very specific wavelength. Two of such wavelengths are practical for the visual observation or photography: the H-α (Hydrogen Alpha) wavelength of ionized hydrogen at 656,28nm, and the light of the Calcium-K line (Ca-K) at 393,4nm.

It is technically very challenging to manufacture such filter, so-called “Etalon”, that together with a “Blocking Filter” really pass through only one wavelength. No filter can do this total exactly. How accurate a filter can really isolate the light of only one wavelength is defined by the so-called “bandwidth”. As smaller the value of the bandwidth is, as more accurate the filter will isolate the wavelength. And as more accurate the wavelength is isolated, as more details you will see on the sun. In the H-alpha range the bandwidth of the filter should be in any case smaller than 1 Angstrom (1 Angstrom = 0.1nm). At the wavelength of Ca-K bandwidth values about 2.5 Angstrom will be okay.

Lunt Solar Systems offers the next generation of solar filters and telescopes. If you want to upgrade a existing astronomical telescope with a filter system for observing the sun, or if you want a complete solar telescope that is right now ready to start - Lunt Solar Systems will guarantee not only fascinating views of the sun, but also 100-percent safety and protection from by the telescope concentrated dangerous radiation of the sun. Also we assure the best quality and always new innovations, like our new air-pressure-tuning system “Pressure Tuner” for the fine adjustment of the Etalon.

Enjoy unforgettable views of our sun - with the advanced solar telescopes and filters of Lunt Solar Systems!