This is a simple technique used along with either sunrise or sun set or both. Here there is no difference in the technique of concentration, we only think of those things that we need to develop (sunrise) or get rid of (sunset), mainly things that are troubling us in our daily life or meditation.

Start our meditation well before sunrise or sunset say at least half hour!

Begin with breath watch, if the flow was in left nostril then concentrate on the right nostril very soon the breath will start to flow in both nostrils, this is the required state of breathing to allow vital energy to flow in the central channel. Try to maintain this. Most of our thoughts will be of non-duality type. This is good! That means we are at the right situation, now use our mantra "SINGLE SYLLABLE" do as many recitation as possible consciously, paying attention to the pronunciation and meaning if we know it, (note if we don't know the meaning it does not matter) until it repeats unconsciously. The vision before us will be blank darkness until the sun rises and bright light before sunsets.

Since it will be dark before sunrise it will be easy to visualize darkness, and come to a state of blankness of thoughts, this is what will happen as we concentrate on the sound of the mantra. If we have a big, enough picture of the mantra then we can use visualizing it. Soon we stop hearing our sound of mantra and just drift into its humming as if it were ending. This is the state we want to be when the sun starts to rise or sets.

There will be a beautiful sensation or feeling of joy as the light glow of the sun begins to become brighter and brighter, now think of those things we want in this life very badly and imagine as if they are growing as the sun rises.

At sun set think of all those problems we want to get rid of and feel that they are dissolving as the sun sets and the light diminishes at total darkness imagine that they are dissolved into darkness.

As we gain more and more perfection in this technique we can guide all the things we want in this life.

Wish you all the best in using this technique