The phrase "simultaneous appearance" is correct and usable in written English.
It is used to refer to two or more things appearing together or appearing at the same time. For example: "The simultaneous appearance of the comet and the eclipse was an amazing sight to behold."
It was proposed that all pigmented heterokonts appeared due to double symbiosis and the simultaneous appearance of the ability to build cell walls with silica [ 24].
The simultaneous appearance of two new Schindler monographs takes McCoy's cause a giant step farther.
"Precious" and "The Blind Side" come from different corners of the movie cosmos, and their simultaneous appearance is entirely accidental.
Rather than offering triumphant aphorisms about California's comeback, or even a sly riff on Christie's simultaneous appearance, the Governor only briefly mentioned the "good news".
Israeli leaders believe that the simultaneous appearance of thousands of civilians marching towards three sensitive borders in different parts of the country suggested a co-ordinated campaign.
Thus, this act of excitation leads to the simultaneous appearance of a pair of particles an ordinary negative electron and a positively charged but otherwise identical positron.
Fortunately, with the more or less simultaneous appearance of Jack Copeland's and Paul Gannon's comprehensive treatments, there is no longer any excuse for such casual disregard for the facts.
The simultaneous appearance of the books doubtless created two anxious publishers, but they complement each other almost perfectly: Kemp's is Leonardo seen from the inside out, Nicholl's from the outside in.
A third is the roughly simultaneous appearance of the "primitive streak," indicating that twinning is no longer possible and also giving the embryo a new level of organization, presaging the development of organs and a nervous system.
In recent weeks, these bird-watching virologists have become worried about what they and the World Health Organization say is the "unprecedented" simultaneous appearance of an avian influenza virus in a number of countries.
You'd think that the publication of these two volumes would make for a powerfully symbolic American cultural moment, like the nearly simultaneous appearance of "The Scarlet Letter" and "Moby-Dick".
