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In English we have a saying "window of opportunity" which means that there is
specific time period where a certain event can occur.

Based on that expression we talk about a "launch window" when it comes to
rockets going into space and what-not. Due to weather or whatever other
factors beyond human control, it is only possible to launch a rocket on
certain days, or the "launch window".

I was reading a Japanese [news article](http://www.minato-
yamaguchi.co.jp/yama/news/digest/2012/0411/1p.html) on the "scientific rocket"
that North Korea plans on launching (who's launch window opens today), and
they use the phrase `「発射通報期間」`. According to dictionaries this means
"Firing/launching report period", but I imagine from the (very clear) context
that this would be "launch window" in English. Now, while from the context of
the article, I know the meaning, but my qeustion is if it is specific to
talking about rockets and the like, or if something can be substituted to talk
about, for example, a job offer (i.e. 求人通報期間?). Is there a phrase, idiomatic
or otherwise, to convey a "window of opportunity"?

As a secondary question, what exactly does 通{つう}報{ほう} mean in this context? I
mean, does it have a meaning other than "report; tip; bulletin; message"?
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set-phrases idioms
Questions on the Japanese equivalent of "window of opportunity"
> Is there a phrase, idiomatic or otherwise, to convey a "window of
> opportunity"?

As you may have noticed, in English, "window" conveys a period of time, that
is why you can say "launch window" and "window of opportunity". To convey
"window of opportunity” in Japanese, there are several phrases that come to
mind:

> 好機到来
>
> 絶好の機会
>
> 今がチャンス

※Side note, you can replace `好機` and `機会` with `チャンス` making `チャンス到来` and
`絶好のチャンス` which I feel makes it more conversational.

However, I think you might be looking for a phrase in Japanese that can be
used idiomatically like "window" is used in English. Unfortunately, there is
no phrase that exists because this is an English idiom.

> As a secondary question, what exactly does 通報 mean in this context? I mean,
> does it have a meaning other than "report; tip; bulletin; message"?

No, there is no special meaning here. `通報` is the act of informing or the
message itself. North Korea said they were planning on launching a missile
within a certain period of time, so the `発射通報期間` is the period in which they
said they were going to launch the missile.

By the way "launch window" in Japanese, is
[打ち上げウィンドウ](http://ja.wikipedia.org/wiki/%E6%89%93%E4%B8%8A%E3%81%92%E3%82%A6%E3%82%A3%E3%83%B3%E3%83%89%E3%82%A6).
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