A couple of years ago, I was on pilgrimage to the Holy Land. On the feast of the Transfiguration of the Lord, our group (along with throngs of others) ascended Mt Tabor on foot to celebrate the divine liturgy at the Church on the summit. The night was beautifully clear and cool. During the liturgy, all of sudden there was light (both as in not heavy and as in luminous) mist that appeared as we sang the "Holy God". This light mist stayed high above the ground and lasted only during the singing of this hymn. Again the sky was clear. Later on, as the Chalice was brought out for the communion, the light mist reappeared, this time just above our heads. During the giving of the communion the mist remained and then disappeared again when the Chalice was taken back into the altar. The sky was again clear. When at the end of the liturgy, the Patriarch brought out the cross for all to venerate, the mist again descended, this time to the ground, enveloping all in its light embrace. This miracle of the holy light that appears every year on Mt Tabor at the feast of the Transfiguration.
Now I've lived in the mountains a lot of my life and I know how the fog comes and goes during the cool nights and I suppose one could easily say that this was just a natural phenomenon of mountain fog. However that does not make the miracle any less a miracle. Even if it were a natural phenomenon, how is it that the mist "knew" to appear and disappear at these particular points of the Divine Liturgy and only on this night? Just because there is a "natural explanation" for some miraculous phenomenon does not make it any less miraculous.
There is an old (and iirc generally discounted) book by a Russian scientist, Immanuel Velikovsky called "Worlds in Collision" In this book he describes a series of planetary events regarding "close" passes to earth by large comets which resulted in a number of atmospheric and even planetary phenomena which he relates to the Great Flood, the plagues of Egypt, the parting of the Red Sea, the pillar of fire and cloud, the manna in the wilderness, the extension of the day of Joshua and a number of other things. Do his explanations (however true or misguided they might have been) in any way impact their miraculous nature? No, not at all. In fact it only points out the marvelous power of God which plans even from the origins of the solar system the orbits of the celestial bodies so that they occurred at the exact time and place that they would be needed by men who had not even been created yet. Think about it; how God plans a celestial near cataclysm set in motion at the birth of the solar system and determined by the laws of orbital physics in order to meet the needs of His chosen people at exactly the right time and the right place. Truly the heavens declare the glory of God.
Fr David Moser