Today is Thursday. The day after $59\text{ days}$ will be:

We need to find the day that falls $59\text{ days}$ after today.
Find the number of odd days by dividing $59$ by $7$:

$$\frac{59}{7}=8\text{ weeks with a remainder of }3\text{ days}$$

Adding $3\text{ days}$ to Thursday:

* 1 day after is Friday
* 2 days after is Saturday
* 3 days after is Sunday

Therefore, the day will be Sunday.