Usually it's simply called a "solar telescope, but there are other names such as "helioscope" (specialising in sunspot observation).
Because they are highly luminous, stars may be observed directly in visible light frequencies. One example is the Sun, which is close to Earth and can be examined easily in the daytime, for example with a helioscope.
By letter (or personal messenger)by the help of doves,pigeons,and faithful owls n eagles, by foot, horse, or ship. There was also semaphore, helioscope (flashing mirrors), and smoke signals for relatively short, important messages.
The fastest method of DNA sequencing as of Jul, 2008 is a tech called HelioScope(tm) that claims to be able to sequence 1.2 Billion bp in 1 hour, using advanced fluorescent microscopy and a suitable marker system. The sequencer costs a scratch over 1 million dollars US, and is probably going to redefine genomics as we know it.
Some words with the root "helio" include heliocentric (having the sun at the center), heliograph (a device used to send messages using sunlight), and heliophobia (fear of sunlight or sunlight exposure).